Remove `update-proxy-release` workflow #7947

Job	Run time
Split workflow (macos-latest, default)	1s
Split workflow (ubuntu-latest, linked)	1m 30s
Split workflow (macos-latest, nightly-latest)	1s
Split workflow (ubuntu-latest, default)	1m 13s
Split workflow (macos-latest, linked)	1s
Split workflow (ubuntu-latest, nightly-latest)	1m 16s
Split workflow (ubuntu-latest, linked)	1m 30s
Split workflow (macos-latest, linked)	1m 46s
Split workflow (macos-latest, nightly-latest)	1m 24s
Split workflow (macos-latest, default)	1m 58s
Split workflow (ubuntu-latest, default)	1m 13s
Split workflow (ubuntu-latest, nightly-latest)	1m 16s
	13m 9s

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