Update metadata for 0.6 release

[vishesh92]

Issue #, if available:

Description of changes:
This pull request includes an update to the metadata.yaml file to add a new release series entry for version 0.6.

• metadata.yaml: Added a new release series entry with major version 0, minor version 6, and contract v1beta1.
  Testing performed:

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vishesh92

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• OWNERS [vishesh92]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.79%. Comparing base (d597e80) to head (48984c2).
Report is 94 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #432      +/-   ##
==========================================
+ Coverage   25.66%   25.79%   +0.12%     
==========================================
  Files          59       72      +13     
  Lines        5563     6742    +1179     
==========================================
+ Hits         1428     1739     +311     
- Misses       3996     4839     +843     
- Partials      139      164      +25     

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[weizhouapache]

/lgtm