Remove per-branch changelogs, reference master version

[julianKatz]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Remove changelogs on release branch, reference master version.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None

[mattcary]

/lgtm
/approve

[tonyzhc]

/lgtm

[mattcary]

/hold

Given offline conversation, maybe just point to the release page & the autogenerated comments instead

[tonyzhc]

/lgtm

[msau42]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: julianKatz, mattcary, msau42

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[k8s-ci-robot]

@julianKatz: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2022	2d08b19	link	false	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2022

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[julianKatz]

/unhold