[ci] Add experimental feature in tests and cargo check (paritytech#1173)

* [ci] Add experimental feature in tests and cargo check

* fix labels GHA

* disable D-labels

* add check license

* add auto-label-issues

* fix CHECK_SPECS for labels

* rm useless commands

* Update .github/workflows/check-labels.yml

* fix

* Fudge license scanner

* remove spellcheck job

---------

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

Author: alvicsam

substrate/.github/workflows/auto-label-issues.yml

@@ -14,4 +14,4 @@ jobs:
         uses: andymckay/labeler@e6c4322d0397f3240f0e7e30a33b5c5df2d39e90 # 1.0.4
         if: github.event.issue.author_association == 'NONE'
         with:
-          add-labels: "J2-unconfirmed"
+          add-labels: "I10-unconfirmed"