Promote Maturity Status to Beta

[dprotaso]

With the latest improvements to net-gateway-api and solidification of the config format (to match what we did in net-istio)

I think we're good to mark this integration as beta so we get some more usage.

[knative-prow]

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[dprotaso]

/assign @izabelacg

/cc @skonto @ReToCode

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.04%. Comparing base (cd525ad) to head (071fc2f).
Report is 38 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #712       +/-   ##
===========================================
+ Coverage   66.97%   77.04%   +10.06%     
===========================================
  Files          15       17        +2     
  Lines         863     1250      +387     
===========================================
+ Hits          578      963      +385     
+ Misses        254      249        -5     
- Partials       31       38        +7     

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[izabelacg]

/lgtm

[dprotaso]

/override "Generate some code!"
/override "style / Golang"
/override "style / suggester / github_actions"
/override "style / suggester / yaml"
/override "style / suggester / shell"

[knative-prow]

@dprotaso: Overrode contexts on behalf of dprotaso: Generate some code!, style / Golang, style / suggester / github_actions, style / suggester / shell, style / suggester / yaml

In response to this:

/override "Generate some code!"
/override "style / Golang"
/override "style / suggester / github_actions"
/override "style / suggester / yaml"
/override "style / suggester / shell"

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