Backport leader status telemetry [VAULT-672]

[HridoyRoy]

Backport Source: https://github.com/hashicorp/vault-enterprise/pull/1501/files
Telemetry: #10137

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[HridoyRoy]

PR Update: CI tests were not running because of vendor issues. Needed to run go mod vendor and clean go.mod and go.sum in order for the tests to pass (go.mod somehow pulled in a conflicting metricsutil package). Go mod vendor made this a large change. Glancing through the vendor changes, they all seem pretty mild and CI does seem to pass, but I'm re-requesting reviews just to be on the safe side.

Thank you!