Fix subscription id removal

[v-iam]

This PR fixes #16 and #23, to ensure that subscription ID is correctly removed in all cases that SubscriptionRecordingProcessor purports to address.

I recommend a new release (0.5.0, probably, since this changes the behavior) after this is merged. Failing to remove the subscription ID seems like a significant problem.

[msftclas]

@v-iam,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[troydai]

I'll test it first.

[troydai]

Add a commit to this PR and it looks good to me. @v-iam you can merge and bump the version and release. I'll do some additional test on CLI side before we begin consuming new release.

[codecov-io]

Codecov Report

Merging #24 into master will decrease coverage by 0.39%.
The diff coverage is 85.71%.

@@            Coverage Diff            @@
##           master      #24     +/-   ##
=========================================
- Coverage   48.16%   47.76%   -0.4%     
=========================================
  Files          10       10             
  Lines         382      381      -1     
  Branches       58       61      +3     
=========================================
- Hits          184      182      -2     
  Misses        194      194             
- Partials        4        5      +1

Impacted Files	Coverage Δ
...re_devtools/scenario_tests/recording_processors.py	55.44% <85.71%> (-1.42%)	⬇️

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