fix: remove and swap usage of run changeset to cld-changeset repo

[ajaskolski]

Swap usage of run changeset to import cld-changeset.
Updated, merged usage in cld -> https://github.com/smartcontractkit/chainlink-deployments/pull/14076
https://smartcontract-it.atlassian.net/browse/CLD-2108

[github-actions]

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[github-actions]

✅ No conflicts with other open PRs targeting develop

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[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[Copilot]

Pull request overview

Risk Rating: HIGH

Migrates remaining RunChangeset call sites from the local deployment helper to the cld-changesets module, while updating related MCMS timelock config usage in CCIP add-chain flows.

Changes:

• Replaced local RunChangeset imports/calls with cld-changesets/pkg/common/changeset.
• Removed the local deployment/common/changeset/run_changeset.go helper.
• Updated system-test module dependencies and CCIP tests to use V2 MCMS timelock config helpers.

Scrupulous human review areas:

• Removal of exported RunChangeset/WrappedChangeSet API from deployment/common/changeset.
• CCIP AddCandidatesForNewChainConfig type change and conversion into framework MCMS config.
• Changeset execution behavior parity between the old local helper and the external cld-changesets helper.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
deployment/common/changeset/run_changeset.go	Removes local exported changeset runner helper.
deployment/ccip/changeset/v1_6/cs_add_new_chain_e2e.go	Uses external changeset runner and V2 MCMS config type.
deployment/ccip/changeset/v1_6/cs_add_new_chain_e2e_test.go	Updates tests to use V2 timelock config helper.
deployment/data-feeds/changeset/new_feed_with_proxy.go	Uses external changeset runner while retaining local ownable contract loader.
integration-tests/smoke/ccip/ccip_add_chain_e2e_test.go	Updates integration setup to use V2 timelock config helper.
system-tests/lib/cre/contracts/contracts.go	Uses external changeset runner for data feeds cache operations.
system-tests/lib/go.mod	Promotes cld-changesets to a direct dependency.
system-tests/tests/go.mod	Promotes cld-changesets to a direct dependency.
system-tests/tests/smoke/cre/por_helpers.go	Uses external changeset runner for Tron PoR setup.
system-tests/tests/smoke/cre/sharding_test.go	Uses external changeset runner for shard count updates.

Comments suppressed due to low confidence (1)

deployment/common/changeset/run_changeset.go:1

• Removing these exported symbols from the deployment module is a breaking API change for any downstream code that still imports deployment/common/changeset.RunChangeset or WrappedChangeSet; the internal callers were migrated, but external callers will now fail to compile. Consider keeping a deprecated forwarding wrapper to cld-changesets/pkg/common/changeset.RunChangeset for a transition period.