test(drive): address review comments on identity test coverage

[QuantumExplorer]

Issue being fixed or feature implemented

Addresses code review comments from PR #3330 (identity test coverage).

What was done?

1. HIGH: BTreeMap ordering assertion is tautological (fetch/mod.rs) -- Replaced with assertions that verify each identity's actual balance is correct in the returned map.

2. MEDIUM: Weak nonce assertion (fetch/nonce/mod.rs) -- Changed assert!(nonce > 0) to assert_eq!(nonce, 1) with documentation explaining why the value is exactly 1 after merging nonce 1 from initial state.

3. MEDIUM: Masternode re-insertion test doesn't verify key re-enablement (insert/add_new_identity/mod.rs) -- Now disables all keys before re-insertion, verifies they are disabled, then verifies they are re-enabled after masternode re-insertion.

4. MEDIUM: Missing edge case -- combined positive balance + negative credit (fetch/balance/mod.rs) -- Added test that sets both positive balance and negative credit, documenting that fetch_identity_balance_include_debt returns just the positive balance when it is nonzero.

5. LOW: .unwrap() without context (fetch/mod.rs) -- Replaced with .expect("descriptive message").

6. LOW: Estimated-mode test asserts hardcoded placeholder (fetch/balance/mod.rs) -- Already documented; the comment explains Some(0) is the expected placeholder in apply=false mode.

7. LOW: assert!(result.is_err()) without checking error type (fetch/balance/mod.rs) -- Now uses matches!(result, Err(Error::GroveDB(_))) with a descriptive failure message.

8. LOW: Missing test for partial results (fetch/mod.rs) -- Added test where one identity exists and another does not, verifying fetch_identities_balances returns only the existing one.

9. NIT: Path tests skip root tree byte verification (mod.rs) -- All path function tests now assert path[0] == RootTree::Identities.

10. NIT: Incomplete enum conversion coverage (mod.rs) -- All three conversion tests (to_u8, to_u8_array, to_static_u8_array_ref) now cover all 6 IdentityRootStructure variants.

How Has This Been Tested?

cargo fmt --package drive
cargo test --package drive -- drive::identity
# 131 passed; 0 failed

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f57df2e5-f76d-4ad4-ab57-053daa94b4e3

📥 Commits

Reviewing files that changed from the base of the PR and between f6d3680 and 77fca0f.

📒 Files selected for processing (5)

• packages/rs-drive/src/drive/identity/fetch/balance/mod.rs
• packages/rs-drive/src/drive/identity/fetch/mod.rs
• packages/rs-drive/src/drive/identity/fetch/nonce/mod.rs
• packages/rs-drive/src/drive/identity/insert/add_new_identity/mod.rs
• packages/rs-drive/src/drive/identity/mod.rs

✨ Finishing Touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch test/drive-identity-review-fixes-v2

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• Generate coding plan for human review comments

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[QuantumExplorer]

@coderabbitai review

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Review triggered.

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[codecov]

Codecov Report

❌ Patch coverage is 92.02454% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.60%. Comparing base (5b95606) to head (77fca0f).
⚠️ Report is 2 commits behind head on v3.1-dev.

Files with missing lines	Patch %	Lines
packages/rs-drive/src/drive/identity/mod.rs	87.75%	6 Missing ⚠️
.../src/drive/identity/insert/add_new_identity/mod.rs	85.71%	4 Missing ⚠️
...s/rs-drive/src/drive/identity/fetch/balance/mod.rs	95.55%	2 Missing ⚠️
packages/rs-drive/src/drive/identity/fetch/mod.rs	97.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           v3.1-dev    #3336      +/-   ##
============================================
+ Coverage     73.48%   73.60%   +0.12%     
============================================
  Files          3295     3295              
  Lines        273133   274156    +1023     
============================================
+ Hits         200703   201793    +1090     
+ Misses        72430    72363      -67     

Components	Coverage Δ
dpp	60.41% <ø> (+<0.01%)	⬆️
drive	79.14% <92.02%> (+0.27%)	⬆️
drive-abci	85.76% <ø> (ø)
sdk	31.25% <ø> (ø)
dapi-client	79.06% <ø> (ø)
platform-version	∅ <ø> (∅)
platform-value	58.46% <ø> (ø)
platform-wallet	60.40% <ø> (ø)
drive-proof-verifier	∅ <ø> (∅)

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