[Python] Type annotation fixes

[dbrattli]

1. Fixes inref type annotation handling - Now only unwraps FSharpRef for struct value types, not all types
2. Fixes outer this capture in object expressions - Properly captures and renames outer self to _this when nested classes reference the enclosing class
3. Optimizes ResizeArray/IEnumerable conversions - Avoids unnecessary wrapping/unwrapping when converting between ResizeArray and IEnumerable

[github-actions]

Python Type Checking Results (Pyright)

Metric	Value
Total errors	24
Files with errors	2
Excluded files	3
New errors	✅ No

Excluded files with errors (3 files)

These files have known type errors and are excluded from CI. Remove from pyrightconfig.ci.json as errors are fixed.

File	Errors	Status
temp/tests/Python/test_applicative.py	23	Excluded
temp/tests/Python/fable_modules/thoth_json_python/encode.py	1	Excluded