[CI] Add manual Gitlab job for running all benchmarks (#3515)

* initial weights job

* add artifact

* revertme: changes to test branch

* add benchmarking instructions

* Revert "revertme: changes to test branch"

This reverts commit 2eab22037223967e66a70a16fda14f58e41c6ced.

* add kusama + westend weights jobs

* fix chevdor comments

* add temporary changes for testing again

* fix

* fix

* test sccache fix

* Revert "add temporary changes for testing again"

This reverts commit bb5a7660151f404994c85abfff31502aac89c1d1.

* whitespace