Severity Curation Enhancements

[keshav-space]

1. Highlight PURL in bold.

   Replace:

   Conflicting CVSS 3.1 Scores
   Conflicting severity scores for package: pkg:pypi/deepspeed

   With:

   Conflicting CVSS 3.1 for: pkg:pypi/deepspeed

2. Show affected and fixed version ranges for PURL.

3. Add tooltip for each CVSS metric.

4. Collapse Temporal and Environmental score sections by default if none of the advisories include those metrics.

5. Remove "hide/show" button for CVSS vector string.