add release note for 3.0 beta1 release

[mingshl]

Description

add release note for 3.0 beta1 release

Related Issues

opensearch-project/opensearch-build#3747

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.33%. Comparing base (0448890) to head (d85b99a).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #3683   +/-   ##
=========================================
  Coverage     80.32%   80.33%           
- Complexity     7019     7020    +1     
=========================================
  Files           615      615           
  Lines         30636    30636           
  Branches       3447     3447           
=========================================
+ Hits          24607    24610    +3     
+ Misses         4532     4531    -1     
+ Partials       1497     1495    -2     

Flag	Coverage Δ
ml-commons	80.33% <ø> (+<0.01%)	⬆️

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