Gitlab CI now allow us to define if a job need to be created by
varialbes. This commit add label to CI jobs, so we can make some jobs
not created in certain scenarios when we trigger pipeline with @bot.
We have built unit-test-app with different configs.
Currently we use the config name as tags to match runners.
It's not easy to add new configs (need to update tags to existed runners).
Now we'll parse required test runner tags from `sdkconfig` file.
For example, if config enables `CONFIG_SPIRAM_SUPPORT`, then it requires `psram` tag.
This will make adding new configs easier.
In this commit we change the one behavior of assign test: match keys of
cases should be exactly the same with job tags. This fixes cases select
jobs include their tags, and jobs requires those tags can't be assigned.
