feat(diagnostics): prepare Thread Dumps for All Targets view, add Capture Diagnostics

[andrewazores]

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See #1647
Depends on cryostatio/cryostat#1030

Description of the change:

• prepares Diagnostics > Analyze > Thread Dumps view for an "All Targets" selection state, similar to Archives view
• feature flags the Diagnostics card's Thread Dump capture button and the Diagnostics > Analyze > Thread Dump view as Beta-level features
• fixes up the main navigation menu to not render nav groups if all the elements within are feature flagged out
• adds thread dump file size to the analysis table

[github-actions]

This PR/issue depends on:

• feat(threaddump): include file size in list query response, simplify metadata cryostat#1030
  By Dependent Issues (🤖). Happy coding!