Add some extra phpcs fixer rules for whitespace

[Crabcyborg]

This helps to prevent extra spaces that shouldn't be there.

These are frequently updated in PRs and I'd rather get rid of them then slowly fix this one at a time. The spaces tend to be distractions when developing.

[coderabbitai]

Walkthrough

This PR applies PHP code style fixer rules to standardize whitespace formatting across the codebase. Changes include removing trailing whitespace, eliminating whitespace in blank lines, and trimming spaces from PHP opening tags. The configuration file enables two new PhpCsFixer rules to enforce these standards.

Changes

Cohort / File(s)	Summary
Code style configuration .php-cs-fixer.php	Enabled two additional PhpCsFixer rules: no_trailing_whitespace and no_whitespace_in_blank_line to automatically trim trailing whitespace and disallow whitespace on blank lines.
Component style formatting classes/views/styles/components/FrmSliderStyleComponent.php	Adjusted spacing in the value_label assignment line within the constructor; no functional changes.
Template formatting classes/views/styles/components/templates/slider.php	Removed trailing spaces from PHP opening tags in the slider template (e.g., <?php → <?php).
Controller whitespace adjustments stripe/controllers/FrmTransLiteActionsController.php	Normalized blank lines in replace_success_message and before_save_settings methods; no behavioral changes.
Test formatting tests/phpunit/helpers/test_FrmCssScopeHelper.php	Adjusted whitespace formatting throughout test file; all test logic and assertions remain unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• All changes are whitespace and formatting only, applied consistently via PhpCsFixer configuration
• No logic, control flow, or functional modifications present
• Verify the two new fixer rules are correctly enabled and don't conflict with existing configuration

Possibly related PRs

• Prepare for 6.25 #2540: Modifies the same file (stripe/controllers/FrmTransLiteActionsController.php) and updates docblock/versioning in the trigger_payment_status_change method.

Pre-merge checks and finishing touches

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The pull request has no author-provided description, making it impossible to assess whether any description was related to the changeset.	Add a pull request description explaining the purpose of enabling the new PhpCsFixer rules and the whitespace changes made throughout the codebase.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: enabling additional PhpCsFixer rules for whitespace handling in the codebase.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add_some_extra_phpcs_fixer_rules_for_whitespace

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