Clean up pipelines in azure-devops after Altinn/altinn-studio swtiched from master to main

[tjololo]

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Context for the task

We have many pipelines running in azure-devops that are defined as yaml files in the Altinn/altinn-studio repo. altinn-studio changed their base branch from master to main, but many of the pipelines where not moved as they are owned by other teams.

All our usecase pipelines are running from both main and master.

Scheduled pipelines should be disabled from master and all other pipelines targeting master should be changed to main.

Discovered pipelines that needs to update its target from master to main:

• [x] platform-k6
• [x] platform-k6-prod
• [x] cleanup

Pipelines that have not been active since the move

• [x] app-owner-test-k6

Pipelines that are running on a schedule from both master and main

• [x] bruksmønster-at22
• [x] bruksmønster-at23
• [x] bruksmønster-at24
• [x] bruksmønster-tt02
• [x] bruksmønster-prod
• [x] bruksmønster-dev-studio

[tjololo]

Had a talk with @framitdavid and decided that master should be deleted as it is nolonger active and is no just another outdated branch. To make the transition "safer" we made the decision to rename it and the at a later time delete it.

[tjololo]

app-owner-test-k6 refers to test scripts that are no longer present in altinn-studio repo (main or master). Think it's safe to assume that this pipeline is not used any more