Add tag_name column to dast_profiles_tags table and backfill

What does this MR do and why?

Add tag_name column to dast_profiles_tags table and bacfill that table

This MR is modeled after Backfill tag_name on ci_runner_taggings (!205101 - merged) • Pedro Pombeiro (OOO from Oct 12th-23th) • 18.5, as suggested here: #582781 (comment 2929824996)

Note: The dast_profiles_tags table does not have nearly as many records as the ci_runner_taggings table, but I kept the same batching strategy.

Changelog: added EE: true

References

#582781

Query plans:

Raw SQL

UPDATE 
	"dast_profiles_tags" 
SET 
	"tag_name" = 'docker'
WHERE 
	"dast_profiles_tags"."id" BETWEEN 0 AND 99
	AND "dast_profiles_tags"."id" >= 8
       	AND "dast_profiles_tags"."tag_id" = 7
	AND "dast_profiles_tags"."tag_name" IS NULL

Plan

See https://postgres.ai/console/gitlab/gitlab-production-sec/sessions/50092/commands/148747 .

 ModifyTable on public.dast_profiles_tags  (cost=0.28..3.30 rows=0 width=0) (actual time=0.062..0.063 rows=0 loops=1)
   Buffers: shared hit=3 read=2
   ->  Index Scan using index_dast_profiles_tags_on_tag_id on public.dast_profiles_tags  (cost=0.28..3.30 rows=1 width=38) (actual time=0.061..0.061 rows=0 loops=1)
         Index Cond: (dast_profiles_tags.tag_id = 7)
         Filter: ((dast_profiles_tags.tag_name IS NULL) AND (dast_profiles_tags.id >= 0) AND (dast_profiles_tags.id <= 99) AND (dast_profiles_tags.id >= 8))
         Rows Removed by Filter: 0
         Buffers: shared hit=3 read=2
Settings: effective_cache_size = '338688MB', jit = 'off', random_page_cost = '1.5', work_mem = '100MB', seq_page_cost = '4'

​

Other artifacts are provided below
Summary:
  
Time: 0.684 ms  
  - planning: 0.563 ms  
  - execution: 0.121 ms  
    - I/O read: N/A  
    - I/O write: N/A  
  
Shared buffers:  
  - hits: 3 (~24.00 KiB) from the buffer pool  
  - reads: 2 (~16.00 KiB) from the OS file cache, including disk I/O  
  - dirtied: 0  
  - writes: 0  
  

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