docs: update our supported version docs to be correct

[sicoyle]

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Description

I brought this table up in the maintainers sync and we agreed to remove it as it easily becomes outdated, and it not actually accurate.

Issue reference

[Copilot]

Pull request overview

Removes the Supported versions table and the Upgrade path table from the release policy docs (and the corresponding maintainer step) since they become outdated quickly and were often inaccurate.

Changes:

• Delete the "Supported versions" table from support-release-policy.md.
• Delete the upgrade-path table from support-release-policy.md.
• Remove the maintainer-guide step that instructs updating the Supported versions table.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
daprdocs/content/en/operations/support/support-release-policy.md	Removes the Supported versions table and the runtime upgrade-path table.
daprdocs/content/en/contributing/docs-contrib/maintainer-guide.md	Removes the release-step referencing the deleted Supported versions table.

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[sicoyle]

cc @marcduiker and @msfussell