Fix SwiftLint failures for latest version (#209)

[sebastianricaldoni]

Summary

• Remove inert_defer and unused_capture_list — no longer valid rule identifiers in SwiftLint 0.63+
• Rename operator_whitespace → function_name_whitespace in .swiftlint.yml and inline disable comment in BalanceExtensions.swift
• Rename redundant_optional_initialization → implicit_optional_initialization in .swiftlint.yml
• Fix closure_end_indentation violation in Constant.swift:46
• Overrides JAVA_HOME to stop using 17 and instead use $JAVA_HOME_21_arm64. firebase emulators:exec was complaining about using older Java version

Test plan

• swiftlint lint --strict passes locally with 0 violations on SwiftLint 0.63.2

Closes #209

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 5.06%. Comparing base (75a2db8) to head (818a495).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #210   +/-   ##
=====================================
  Coverage   5.06%   5.06%           
=====================================
  Files        130     130           
  Lines       2158    2158           
=====================================
  Hits         109     109           
  Misses      2049    2049           

Files with missing lines	Coverage Δ
Balance/Utils/BalanceExtensions.swift	4.55% <ø> (ø)
Balance/Utils/Constant.swift	0.00% <ø> (ø)

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[Copilot]

Pull request overview

Updates the repo’s SwiftLint configuration and related source annotations to be compatible with newer SwiftLint versions (0.63+), resolving CI lint failures; additionally adjusts the CI test command to explicitly set up Java before running Firebase emulators.

Changes:

• Remove/rename SwiftLint rule identifiers in .swiftlint.yml to match SwiftLint 0.63+.
• Update inline SwiftLint disable comment in BalanceExtensions.swift and fix an indentation violation in Constant.swift.
• Modify the CI build-and-test workflow’s custom command to export a specific Java home before running emulator-backed tests.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
Balance/Utils/Constant.swift	Fixes closure_end_indentation by adjusting the closure end indentation.
Balance/Utils/BalanceExtensions.swift	Updates inline SwiftLint rule disable to the renamed rule identifier.
.swiftlint.yml	Removes obsolete rules and renames rules to new SwiftLint identifiers.
.github/workflows/build-and-test.yml	Adds explicit Java env setup before running firebase emulators:exec tests.

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