Release News for v1.2.0

[arkodg]

• Updates Release Notes on Website with Release Note content from https://github.com/envoyproxy/gateway/blob/main/release-notes/v1.2.0.yaml

• Updated Release News with the release summary

• Updated the Release Schedule matrix

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (main@44408dd). Learn more about missing BASE report. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4650 +/- ## ======================================= Coverage ? 65.55% ======================================= Files ? 211 Lines ? 31945 Branches ? 0 ======================================= Hits ? 20941 Misses ? 9761 Partials ? 1243 ```

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