Rake task to bump CI tables sequences

What does this MR do and why?

Adding a Rake Task to help with Rollback, in the DB Decomposition Phase 7, to bump all the CI Tables Sequences.

Rake task: gitlab:db:decomposition:rollback:bump_ci_sequences

Issue: #362321 (closed)

How to set up and validate locally

$ gdk psql -c 'select last_value from ci_build_needs_id_seq'
 last_value 
------------
       1103
(1 row)

$ rake gitlab:db:decomposition:rollback:bump_ci_sequences

$ gdk psql -c 'select last_value from ci_build_needs_id_seq'
 last_value 
------------
     101104
(1 row)

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