chore: allow canary releases

[dobrac]

Note

Medium Risk
Changes CI release/publishing behavior and adds manual triggers with custom tags/preids, increasing the chance of accidental or mis-tagged prerelease publishes if inputs/labels are wrong.

Overview
Adds workflow_dispatch support to release_candidates.yml so maintainers can manually publish prereleases for js-sdk, cli, and python-sdk without relying solely on PR labels.

Introduces a sanitized PREID (defaults to branch/ref) and a configurable npm dist-tag (tag, default rc), updates publish steps to use these values, and blocks publishing with the latest tag from this workflow. Also refines step gating via IS_JS/IS_CLI/IS_PYTHON env flags and adjusts checkout ref to work for both PR and manual runs.

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Latest commit: 339a95d

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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