deployment: add readiness probe to hybrid environment overlays

[nimrod-starkware]

Cross-repo PR: https://github.com/starkware-industries/sequencer-devops/pull/715

Cross-repo PR: https://github.com/starkware-industries/sequencer-devops/pull/715

[reviewable-StarkWare]

This change is 

[nimrod-starkware]

• deployment: add gcp pod monitoring to hybrid environment overlays #14192 : 2 dependent PRs (#14196 , #14242 )
• deployment: add liveness probe to hybrid environment overlays #14191
• deployment: add readiness probe to hybrid environment overlays #14190 👈 (View in Graphite)
• deployment: add startup probe to hybrid environment overlays #14188
• deployment: add monitoring endpoint port to hybrid environment overlays #14187
• main-v0.14.3

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[cursor]

PR Summary

Low Risk
Kubernetes deployment overlay only; no application logic changes, with modest rollout behavior impact if /monitoring/ready is misconfigured.

Overview
Adds an enabled readiness probe on /monitoring/ready to the hybrid sequencer common overlays for mainnet, sepolia-alpha, and sepolia-integration, alongside the existing startup probe on /monitoring/alive.

Probe settings are aligned across environments: 5s period, 2s timeout, success threshold 2, failure threshold 3. Pods should only receive traffic once the sequencer reports ready, improving rolling updates and avoiding routing to instances that are up but not yet serving.

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[dorimedini-starkware]

@dorimedini-starkware reviewed 3 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on idan-starkware and matanl-starkware).

[dorimedini-starkware]

@dorimedini-starkware reviewed 3 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on idan-starkware and matanl-starkware).

[graphite-app]

Merge activity

• May 28, 10:12 AM UTC: Graphite rebased this pull request, because this pull request is set to merge when ready.

[dorimedini-starkware]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on idan-starkware and matanl-starkware).