[CT-1100] initial snowflake conversion of concurrency test

[McKnight-42]

resolves core counterpart 5753

Description

snowflake conversion od 021_test_concurrency

Checklist

• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have run changie new to create a changelog entry

[McKnight-42]

TODO: fix new syntax error after swapping to csv method

Invoking dbt with ['seed', '--select', 'update']
22:15:17  Running with dbt=1.3.0-b2
22:15:17  Found 7 models, 0 tests, 0 snapshots, 0 analyses, 286 macros, 0 operations, 2 seed files, 0 sources, 0 exposures, 0 metrics
22:15:17
22:15:20  Concurrency: 4 threads (target='default')
22:15:20
22:15:20  1 of 1 START seed file test16630208886180667051_test_concurrency.update ........ [RUN]
22:15:22  1 of 1 ERROR loading seed file test16630208886180667051_test_concurrency.update  [ERROR in 1.40s]
22:15:22
22:15:22  Finished running 1 seed in 0 hours 0 minutes and 4.68 seconds (4.68s).
22:15:22
22:15:22  Completed with 1 error and 0 warnings:
22:15:22
22:15:22  Database Error in seed update (seeds/update.csv)
22:15:22    001003 (42000): SQL compilation error:
22:15:22    syntax error line 1 at position 63 unexpected '.'.
22:15:22
22:15:22  Done. PASS=0 WARN=0 ERROR=1 SKIP=0 TOTAL=1

not seeing anything particular sticking out in the seed in core test seeds__update_csv.

[ChenyuLInx]

LGTM

[ChenyuLInx]

This should be removed before merge