deployment/ccip/changeset: optional MCMS for promote candidate

[makramkd]

Add an optional MCMS config that, when nil, will simply execute the
transactions to promote the candidate config using the deployer key.
When non-nil, it only generates the MCMS proposals.

Updated some of the validation as well and removed previous validation
that was incorrect.

Requires

Supports

[github-actions]

Flakeguard Summary

Ran new or updated tests between develop and 5649294 (mk/mcms-optional-activecandidatecs).

View Flaky Detector Details | Compare Changes

Found Flaky Tests ❌

Name	Pass Ratio	Panicked?	Timed Out?	Race?	Runs	Successes	Failures	Skips	Package	Package Panicked?	Avg Duration	Code Owners
Test_PromoteCandidate	33.33%	false	false	false	3	1	2	0	github.com/smartcontractkit/chainlink/deployment/ccip/changeset	false	17.22s	@smartcontractkit/ccip, @smartcontractkit/core
Test_PromoteCandidate/MCMS_enabled	33.33%	false	false	false	3	1	2	0	github.com/smartcontractkit/chainlink/deployment/ccip/changeset	false	9.2s	@smartcontractkit/ccip, @smartcontractkit/core

Artifacts

For detailed logs of the failed tests, please refer to the artifact failed-test-results-with-logs.json.

[github-actions]

AER Report: CI Core ran successfully ✅

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AER Report: Operator UI CI ran successfully ✅

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