Add gateway-api RBAC to helm chart clusterrole

[michaelvl]

Description

This PR adds gateway-API RBAC to Helm chart. This basically codifies the procedure described in docs/tutorials/gateway-api.md

Checklist

• Unit tests updated
• End user documentation updated

Note: both of the above are NA for this addition.

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[stevehipwell]

Thanks for the PR this looks good @michaelvl but could you add a new unreleased section to the chart CHANGELOG to cover your changes so they get documented when the next release comes out.

[michaelvl]

Thanks @stevehipwell - I have added a notice to the changelog.

[stevehipwell]

@michaelvl could you squash your commits?

[michaelvl]

@stevehipwell sure. Done.

[stevehipwell]

/ok-to-test

[stevehipwell]

@Raffo @seanmalloy could you take a look at this and give a LGTM?

/approved

[Raffo]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MichaelVL, Raffo

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