fix: reenable codegen for CF & codegen quality improve

[kh9n]

A few improvments:

1. Fix an issue that not able to identify custom functions.
2. Fix an issue that not able to fetch declaration summaries if the summary contains multiple elements (Link, paragraph, etc.)
3. Check the token length in the getMostRelevantDeclarationsUsingLLM method and shorten on demand to avoid token overload.
4. Fix an issue in getMostRelevantDeclarationsUsingLLM that in some case, a few classes will be dropped from the detect methods or property process.
5. Rewrite some prompts to improve the code generation accurency.

[codecov]

Codecov Report

Attention: Patch coverage is 90.18405% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 88.35%. Comparing base (e1b11d5) to head (96826d0).
Report is 18 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #11524      +/-   ##
==========================================
+ Coverage   88.19%   88.35%   +0.16%     
==========================================
  Files         535      536       +1     
  Lines       32144    32304     +160     
  Branches     6328     6324       -4     
==========================================
+ Hits        28348    28541     +193     
+ Misses       1876     1841      -35     
- Partials     1920     1922       +2     

Files	Coverage Δ
.../src/officeChat/common/skills/codeIssueDetector.ts	100.00% <100.00%> (ø)
packages/vscode-extension/src/officeChat/consts.ts	100.00% <100.00%> (+25.00%)	⬆️
...s/vscode-extension/src/officeChat/officePrompts.ts	94.95% <100.00%> (+2.85%)	⬆️
packages/vscode-extension/src/officeChat/utils.ts	100.00% <ø> (ø)
...src/officeChat/common/skills/codeIssueCorrector.ts	94.44% <81.81%> (+7.30%)	⬆️
...tension/src/officeChat/common/declarationFinder.ts	87.25% <71.42%> (-1.51%)	⬇️
...sion/src/officeChat/common/skills/codeGenerator.ts	94.15% <87.50%> (+8.22%)	⬆️
...on/src/officeChat/common/samples/sampleProvider.ts	94.33% <93.47%> (+18.51%)	⬆️

... and 9 files with indirect coverage changes