Add main branch references for CAPM3

[kashifest]

This PR adds main branch references for CAPM3 since we are renaming the default branch main.

[kashifest]

/assign @fmuyassarov
/cc @furkatgofurov7

[furkatgofurov7]

/test-integration

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fmuyassarov

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[fmuyassarov]

/lgtm
Merging it to speed up the branch renaming process.

[metal3-io-bot]

@kashifest: Updated the config configmap in namespace prow at cluster default using the following files:

• key config.yaml using file prow/config/config.yaml

In response to this:

This PR adds main branch references for CAPM3 since we are renaming the default branch main.

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