Fixed the Validation for bbs-shared-home and archive-path

[AakashSuresh2003]

This PR refines the validation for BbsSharedHome and ArchivePath inputs.

Validation Enhancements:

• Validated that the BbsSharedHome directory exists if provided and ArchivePath is not set.
• Ensured that the ArchivePath file exists if provided.

---

• [x] Did you write/update appropriate tests
• [ ] Release notes updated (if appropriate)
• [x] Appropriate logging output
• [x] Issue linked
• [x] Docs updated (or issue created)
• [ ] New package licenses are added to ThirdPartyNotices.txt (if applicable)

[github-actions[bot]]

Unit Test Results

869 tests   869 ✅  20s ⏱️   1 suites    0 💤   1 files      0 ❌

Results for commit 58bf2900.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
gei	81%	73%	596	✔
ado2gh	84%	78%	631	✔
bbs2gh	82%	76%	681	✔
Octoshift	87%	74%	1403	✔
Summary	84% (7200 / 8549)	75% (1685 / 2246)	3311	✔

[AakashSuresh2003]

PR Summary:

This PR refines the validation for BbsSharedHome and ArchivePath inputs.

Validation Enhancements:

• Validated that the BbsSharedHome directory exists if provided and ArchivePath is not set.
• Ensured that the ArchivePath file exists if provided.

Unit Tests:

• Added unit tests to verify that no exception is thrown when:
  • BbsSharedHome exists.
  • ArchivePath exists.
  • Both BbsSharedHome and ArchivePath are valid.