[7.x] [Uptime]Refactor header and action menu (#83779)

[shahzad31]

Backports the following commits to 7.x:

• [Uptime]Refactor header and action menu ([Uptime]Refactor header and action menu #83779)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 631abd2

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
uptime	540	543	+3

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
uptime	1006.1KB	1005.8KB	-267.0B

Distributable file count

id	before	after	diff
default	47300	48060	+760

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@elasticmachine merge upstream