Introduce `verify` target

[aaronfern]

How to categorize this issue?

/area ops-productivity
/kind enhancement
/priority 3

What would you like to be added:
Currently we have three separate make targets that we want to run before we merge a PR or say that a PR is ready to be consumed

• make check
• make build
• make test

Since we need all three to run and pass, we can combine them into a single target make verify. This target should run all the above mentioned make targets

Why is this needed:
This is needed to consolidate multiple make targets. This will also get us to simplify our pipeline definitions as it gives us one step to configure instead of 3 and hence only one golang version needs to be specified and this can be moved to branch.cfg

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Changes/PRs to be filed to close this story

• MCM
• MCM-provider-extensions
  • AWS
  • Azure
  • GCP
  • Openstack - Already done
  • Alicloud

[gardener-robot]

@aaronfern Label area/todo does not exist.