ci: publish prepackaged Helm charts

[loveRhythm1990]

Summary

• prepackage both kruise-1.8.3.tgz and matrixone-operator-1.3.0-alpha.4.tgz with Helm
• embed the local Kruise package in the parent Chart before packaging it
• use chart-releaser only to upload the prepared archives and update the GitHub Pages index
• preserve the existing release naming and skip-existing behavior

Why

The Chart Publish run triggered after #611 failed while chart-releaser v1.4.1 packaged the parent Chart:

Packaging chart 'charts/matrixone-operator'...
Error: can't get a valid version for repositories kruise

Although the workflow had already placed kruise-1.8.3.tgz under the parent Chart, cr package tried to resolve Kruise v1.8.3 from the remote MatrixOrigin Chart repository before that version had been published.

This change removes that publication-order dependency. Merging it to main will trigger Chart Publish again and should create:

• chart-1.8.3
• chart-1.3.0-alpha.4

Failed run: https://github.com/matrixorigin/matrixone-operator/actions/runs/32573542424

Validation

• actionlint .github/workflows/release_chart.yml
• generated both expected archives in a clean temporary Chart tree
• verified the parent archive embeds Kruise v1.8.3
• helm lint passed for the packaged parent Chart
• confirmed the pinned chart-releaser action supports install_only
• make verify

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