Add global release notes template

[dsimansk]

Changes

• 🎁 Add global release notes template

The format is a merge between our common templates we use in release blog and k8s release-notes tool we used so far.

With the template in place, release leads don't have to execute GH action to produce release notes in .md and copy it over. Rather press Generate release notes button in release edit view.
Future enhancement to consider, the process can be further automated with GH API calls, it's not 1 step process, but rather a chain. In a nutshell POST to generate notes with inputs -> content in response -> POST to edit/update release body.

/cc @knative/knative-release-leads
/cc @knative/technical-oversight-committee

Fixes knative/community#1499

Based on docs:
https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes#example-configurations

Preview from knative/client current main:

[knative-prow]

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This pull-request has been approved by: dsimansk

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[dsimansk]

Markdown format of the preview:

<!-- Release notes generated using configuration in .github/release.yml at main -->
## What's Changed
### 💫 New Features & Enhancements
* Add option flags to define nodeSelector, nodeAffinity and toleration on Knative Service by @Shashankft9 in https://github.com/knative/client/pull/1924
### 🛠 Other Changes
* Add release note template by @dsimansk in https://github.com/knative/client/pull/1956

## New Contributors
* @Shashankft9 made their first contribution in https://github.com/knative/client/pull/1924

**Full Changelog**: https://github.com/knative/client/compare/knative-v1.14.0...v0.0.1-release-notes

[Cali0707]

@dsimansk it looks like the action is failing with:

Error: knative/.github is not the source of truth.  Please send a Pull Request to 'knative-extensions/.github' instead.

[dsimansk]

@dsimansk it looks like the action is failing with:

Error: knative/.github is not the source of truth.  Please send a Pull Request to 'knative-extensions/.github' instead.

Unexpected plot twist, but makes sense. I thought both knative/.github and knative-extensions/.github are independent. I'll recreate the PR. Thanks for pointer!

[dsimansk]

Superseded by SoT PR: knative-extensions/.github#281
/close

[knative-prow]

@dsimansk: Closed this PR.

In response to this:

Superseded by SoT PR: knative-extensions/.github#281
/close

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