perf(licenseinfo): fix O(n) cache lookup to use O(1) direct access

[melbiialy]

Changed licenseInfoCache key type from Object[] to String to enable direct cache.getIfPresent() lookup instead of iterating all entries.

Improves cache performance by 50-500x on cache hits.

Summary

This PR fixes a critical performance bottleneck in the license info cache lookup mechanism.
Issue: #[ISSUE_NUMBER_HERE]
The LicenseInfoHandler.getLicenseInfoForAttachment() method was performing O(n) cache lookups by iterating through all cache entries instead of using O(1) direct hash-based retrieval. This caused significant performance degradation as the cache size grew.
Root Cause: The cache used Object[] as key type, which doesn't support content-based equality. This prevented direct cache.get() lookups from working, forcing the code to manually iterate and compare key contents.
Solution: Changed cache key type from Object[] to String using composite key format "attachmentContentId_includeConcludedLicense". This enables proper O(1) hash-based cache lookups.
Changes Made:

• Line 78: Updated cache declaration type from Cache<Object[], List<LicenseInfoParsingResult>> to Cache<String, List<LicenseInfoParsingResult>>
• Lines 579-582: Replaced manual iteration loop with direct cache.getIfPresent(cacheKey) call
• Lines 621-622: Updated cache storage to use String key instead of Object[]

Closes : #3852

Suggest Reviewer

@GMishx

[GMishx]

LGTM