Add ci_runner_versions table and index_ci_runners_on_version index

What does this MR do and why?

Describe in detail what your merge request does and why.

This MR introduces the ci_runner_versions table which will contain all Runner versions in use from ci_runners.version, in order to support computed state such as the upgrade status of a given release. There will be an upcoming MR which will introduce a cron worker to periodically update the status column, as well as add/delete versions as necessary.

Part of GraphQL: Expose filter on GitLab Runner upgrade... (#358406 - closed)

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Migrations

Migrate up

main: == 20220624081524 AddCiRunnerVersionsTable: migrating =========================
main: -- create_table(:ci_runner_versions, {:id=>false})
main:    -> 0.0034s
main: == 20220624081524 AddCiRunnerVersionsTable: migrated (0.0038s) ================

main: == 20220624090458 AddIndexOnRunnerVersion: migrating ==========================
main: -- transaction_open?()
main:    -> 0.0000s
main: -- index_exists?(:ci_runners, :version, {:name=>"index_ci_runners_on_version", :algorithm=>:concurrently})
main:    -> 0.0040s
main: -- execute("SET statement_timeout TO 0")
main:    -> 0.0001s
main: -- add_index(:ci_runners, :version, {:name=>"index_ci_runners_on_version", :algorithm=>:concurrently})
main:    -> 0.0010s
main: -- execute("RESET statement_timeout")
main:    -> 0.0002s
main: == 20220624090458 AddIndexOnRunnerVersion: migrated (0.0091s) =================

ci: == 20220624062300 DeleteBackfillCiRunnerSemverMigration: migrating ============
ci: == 20220624062300 DeleteBackfillCiRunnerSemverMigration: migrated (0.0107s) ===

ci: == 20220624081524 AddCiRunnerVersionsTable: migrating =========================
ci: -- create_table(:ci_runner_versions, {:id=>false})
ci:    -> 0.0034s
ci: == 20220624081524 AddCiRunnerVersionsTable: migrated (0.0035s) ================

ci: == 20220624090458 AddIndexOnRunnerVersion: migrating ==========================
ci: -- transaction_open?()
ci:    -> 0.0000s
ci: -- index_exists?(:ci_runners, :version, {:name=>"index_ci_runners_on_version", :algorithm=>:concurrently})
ci:    -> 0.0038s
ci: -- execute("SET statement_timeout TO 0")
ci:    -> 0.0001s
ci: -- add_index(:ci_runners, :version, {:name=>"index_ci_runners_on_version", :algorithm=>:concurrently})
ci:    -> 0.0010s
ci: -- execute("RESET statement_timeout")
ci:    -> 0.0001s
ci: == 20220624090458 AddIndexOnRunnerVersion: migrated (0.0064s) =================

Migrate down

main: == 20220624090458 AddIndexOnRunnerVersion: reverting ==========================
main: -- transaction_open?()
main:    -> 0.0000s
main: -- indexes(:ci_runners)
main:    -> 0.0089s
main: -- execute("SET statement_timeout TO 0")
main:    -> 0.0001s
main: -- remove_index(:ci_runners, {:algorithm=>:concurrently, :name=>"index_ci_runners_on_version"})
main:    -> 0.0020s
main: -- execute("RESET statement_timeout")
main:    -> 0.0001s
main: == 20220624090458 AddIndexOnRunnerVersion: reverted (0.0165s) =================

ci: == 20220624090458 AddIndexOnRunnerVersion: reverting ==========================
ci: -- transaction_open?()
ci:    -> 0.0000s
ci: -- indexes(:ci_runners)
ci:    -> 0.0060s
ci: -- execute("SET statement_timeout TO 0")
ci:    -> 0.0001s
ci: -- remove_index(:ci_runners, {:algorithm=>:concurrently, :name=>"index_ci_runners_on_version"})
ci:    -> 0.0016s
ci: -- execute("RESET statement_timeout")
ci:    -> 0.0001s
ci: == 20220624090458 AddIndexOnRunnerVersion: reverted (0.0120s) =================

main: == 20220624081524 AddCiRunnerVersionsTable: reverting =========================
main: -- drop_table(:ci_runner_versions, {:if_exists=>true})
main:    -> 0.0019s
main: == 20220624081524 AddCiRunnerVersionsTable: reverted (0.0025s) ================

ci: == 20220624081524 AddCiRunnerVersionsTable: reverting =========================
ci: -- drop_table(:ci_runner_versions, {:if_exists=>true})
ci:    -> 0.0014s
ci: == 20220624081524 AddCiRunnerVersionsTable: reverted (0.0020s) ================

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