chore: Minor fixes and split pre-release workflow into 2 separate workflows.

[AjayJagan]

Description

1. Add "v" in the pushed tag(quay).
2. Add logic to remove duplicate entries(read from tracker) in the release notes.
3. Split pre-release workflow into 2 separate workflows. This is done to eliminate the need to retrigger whole workflow when the e2e fails.
4. Remove wait-for-checks.sh script as we no longer need to wait for e2e and we can manually trigger the next workflow.

How Has This Been Tested?

Tested by running gh actions in my repo.
https://github.com/AjayJagan/opendatahub-operator/actions/runs/10936169592
https://github.com/AjayJagan/opendatahub-operator/actions/runs/10936181720

Merge criteria

• You have read the contributors guide.
• Commit messages are meaningful - have a clear and concise summary and detailed explanation of what was changed and why.
• Pull Request contains a description of the solution, a link to the JIRA issue, and to any dependent or related Pull Request.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[AjayJagan]

@VaishnaviHire ^

[VaishnaviHire]

/lgtm

[openshift-ci]

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