gitlab_ci_pipeline_job_run_count is counted for old runner instead on new one

[mklpanasiuk]

Steps to reproduce:

1. Run pipeline job with RUNNER_1
2. Run the same job with RUNNER_2 after the previous run

Actual result: gitlab_ci_pipeline_job_run_count has the label "runner_description"=RUNNER_1 for a while and then it changes to "runner_description"=RUNNER_2

Expected result: gitlab_ci_pipeline_job_run_count has the correct label at once. Please note: it works perfectly for gitlab_ci_pipeline_job_id.

I guess you did it intentionally to reduce the metrics count and to detect job runs as runner_description changes all the time