feat(workflows): Add index by workflow_id and pkey

[javirln]

This patch creates a new index on the workflows table by organization_id and id since there are some queries that can benefit from it. Making organization_id the first in the index since it's the most selective column.

Since the records that I have locally are not that much the PostgreSQL query engine does not leverage the use of the index and will perform a regular sequential scan, but deactivating sequential scans, we can see how it used:

# Deactivates seqscan for queries
SET SESSION enable_seqscan = off;

# Query
EXPLAIN ANALYSE
SELECT "workflows"."id",
       "workflows"."name",
       "workflows"."project",
       "workflows"."team",
       "workflows"."runs_count",
       "workflows"."created_at",
       "workflows"."deleted_at",
       "workflows"."public",
       "workflows"."organization_id",
       "workflows"."description",
       "workflows"."workflow_contract"
FROM "workflows"
WHERE ("workflows"."organization_id" = '93d02275-853c-4ad6-9d60-8f562b123fd2' AND "workflows"."deleted_at" IS NULL)
  AND "workflows"."id" IN (
                           'c6bd7e59-9ef6-40fa-91da-898853d0b2c6',
                           '71588af4-d4aa-4cbe-9926-8958b1334a95');

# Result
Bitmap Heap Scan on workflows  (cost=4.29..8.57 rows=1 width=118) (actual time=0.063..0.080 rows=2 loops=1)
  Recheck Cond: ((organization_id = '93d02275-853c-4ad6-9d60-8f562b123fd2'::uuid) AND (deleted_at IS NULL))
"  Filter: (id = ANY ('{c6bd7e59-9ef6-40fa-91da-898853d0b2c6,71588af4-d4aa-4cbe-9926-8958b1334a95}'::uuid[]))"
  Rows Removed by Filter: 26
  Heap Blocks: exact=4
  ->  Bitmap Index Scan on workflow_organization_id_id  (cost=0.00..4.29 rows=19 width=0) (actual time=0.042..0.042 rows=28 loops=1)
        Index Cond: (organization_id = '93d02275-853c-4ad6-9d60-8f562b123fd2'::uuid)
Planning Time: 0.469 ms
Execution Time: 0.150 ms

Refs: #1375