Add meta selectors for jobs to select runner on architecture/os/executor

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Description

With only tags it's difficult to have jobs run on specific runners types.

For example. With the gitlab.com shared runners the following is not posible

build amd64:
  tags:
    - docker
    - amd64

build arm64:
  tags:
    - docker
    - arm64

In this case the build amd64 job will not run

Removing the amd64 tag makes the job run on the arm64 tagged runner which is not what we want.

Proposal

Add meta tags on every runner specifying architecture/platform/executor and maybe version

something like this

build amd64:
  tags:
    - executor=docker
    - arch=amd64

build arm64:
  tags:
    - executor=docker
    - arch=arm64

which would both run on runner allowing untagged jobs because only meta selectors are used in this case both jobs would require the docker executor, one would run on 64bit intel and one on a arm runner.

Links to related issues and merge requests / references