NoOpImplementation improvements [3/3] RUM-7390 Add NoOp name collision detection and customName support

[satween]

What does this PR do?

Adds collision detection to the NoOp KSP processor and a new customName parameter to @NoOpImplementation. When two interfaces would generate the same NoOp* class name (e.g. Outer.Inner and OuterInner both produce NoOpOuterInner), the processor now emits a clear error and suggests using customName to resolve the conflict. The customName parameter lets callers override the generated class name entirely.

Motivation

Without collision detection, two distinct interfaces silently clobber each other's generated file, producing broken or incomplete NoOp implementations at build time with no diagnostic. The new guard catches this at KSP processing time with actionable error messages.

Additional Notes

• Validates customName against a Kotlin identifier regex and reports a clear error for names like "My.Invalid.Name".
• Detects both same-round name collisions (via an in-process generatedNames map) and pre-existing file conflicts (via FileAlreadyExistsException).
• ThrowingCodeGeneratorProvider test helper retained because KSP 1.8.0 does not throw FileAlreadyExistsException for disk files from previous builds; two-pass compilation silently overwrites.
• All 8 new test cases pass; no existing tests regressed.
• generateNoOpImplementation refactored into resolveNoOpClassName, reportNameCollision, and writeNoOpFile helpers to satisfy detekt LongMethod / ReturnCount limits.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

Ref: RUM-7390

[satween]

• NoOpImplementation improvements [3/3] RUM-7390 Add NoOp name collision detection and customName support #3470 👈 (View in Graphite)
• NoOpImplementation improvements [2/3] Guard NoOp generation against restricted-visibility #3469
• NoOpImplementation improvements [1/3] Support for nested interfaces #3468
• develop

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.18%. Comparing base (00897b2) to head (62ae506).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3470      +/-   ##
===========================================
- Coverage    72.20%   72.18%   -0.02%     
===========================================
  Files          964      964              
  Lines        35554    35554              
  Branches      5922     5922              
===========================================
- Hits         25669    25663       -6     
- Misses        8269     8282      +13     
+ Partials      1616     1609       -7     

see 35 files with indirect coverage changes

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