Fix Deck OAuth

[timebertt]

Switch from App auth to robot PAT in deck (used for resolving teams for the rerun auth configs).
Currently, OAuth flow isn't implemented in combination with app auth: kubernetes/test-infra#23870

With this, deck OAuth flow is fixed, i.e. one can now use the personal PR dashboard (https://prow.gardener.cloud/pr) and the rerun button triggers new jobs (if you're part of the required team).

[rfranzke]

/lgtm

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rfranzke, timebertt

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[gardener-prow]

@timebertt: Updated the job-config configmap in namespace prow at cluster gardener-prow-trusted using the following files:

• key postsubmits.yaml using file ``
• key ci-infra-postsubmits.yaml using file config/jobs/ci-infra/ci-infra-postsubmits.yaml
• key presubmits.yaml using file ``
• key ci-infra-presubmits.yaml using file config/jobs/ci-infra/ci-infra-presubmits.yaml

In response to this:

Switch from App auth to robot PAT in deck (used for resolving teams for the rerun auth configs).
Currently, OAuth flow isn't implemented in combination with app auth: kubernetes/test-infra#23870

With this, deck OAuth flow is fixed, i.e. one can now use the personal PR dashboard (https://prow.gardener.cloud/pr) and the rerun button triggers new jobs (if you're part of the required team).

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