remove release tools, update gitignore

[krishchow]

This PR removes the release-tools folder and switches to using the release tools from the COSI spec repository.

[k8s-ci-robot]

Hi @krishchow. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[krishchow]

cc @brahmaroutu @rrati

[brahmaroutu]

Please add the Makefile

[brahmaroutu]

/test pull-container-object-storage-interface-csi-adapter-build

[wlan0]

/ok-to-test

[wlan0]

pls add a newline at the end

[wlan0]

pls add a new line at the end

[brahmaroutu]

/lgtm
Please address the comments in the other pr, once you rebase this.

[brahmaroutu]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brahmaroutu, krishchow

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