feat(block-scheduler): introduce job lease and requeue expired jobs

[ashwanthgoli]

What this PR does / why we need it:

Introduces a job lease checker to expire jobs that have not received any updates from the builders for -jobqueue.lease-duration. Expired jobs are immediately re-enqueued so that this work can be assigned to another available builder.
This is helpful when a builder that picked a job is now unavailable either because it restarted, crashed or has become unresponsive, in such cases it is better to assign this work to another builder so as to not fall behind.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

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