Point yaml-language-server to helm-testsuite's grammar

This allows Emacs to configure automatically Eglot to it asks the LSP to use the included grammar when editing Helm unittest files in this repository.

requested review from @bgarrido

Looks good to me, I've been trying to see if there were some best-practices on how to structure this specific editor files in the repos but not much I could find

approved this merge request

added 2 commits

• 05a227ac - 1 commit from branch master
• 44506dcc - Point yaml-language-server to helm-testsuite's grammar

Compare with previous version

enabled an automatic merge when all merge checks for 44506dcc pass

merged