test : add unit tests for repo-analytics-utils.ts

[tmdeveloper007]

Summary of What Needs to be Done:
Add unit tests for the repo-analytics-utils.ts utility module covering parseRepoParam function.

Changes that Need to be Made:

• Create test/repo-analytics-utils.test.ts
• Add tests for parseRepoParam with valid owner/repo strings
• Add tests for owner with hyphens, underscores, numbers
• Add tests for repo with dots, hyphens, underscores
• Add tests for whitespace trimming
• Add tests for invalid inputs (empty string, missing slash, double slash, . and .. repos, hyphen-prefixed owner)

Impact that it would Provide:
Increases test coverage and ensures repository parameter parsing handles all valid formats and rejects malformed inputs.

Hello @Priyanshu-byte-coder, please assign this issue to me (@tmdeveloper007) so I can open a focused PR.