add changes to account for timeseries migration errors

[adrian-codecov]

Timeseries table errored out at times because certain tables expected auth and contenttypes initial migration. This change is to add those for new and existing migrations. I also reorganized this a bit to perform migrations for the default and/or timeseries dbs.

Easiest way to review this is to open the file altogether and read it. I created new methods for our default and timeseries dbs to make this easier to read + scale.

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[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 86.60%. Comparing base (f271d03) to head (fba472e).

❗ Current head fba472e differs from pull request most recent head 9bf97fa. Consider uploading reports for the commit 9bf97fa to get more accurate results

Files	Patch %	Lines
...s/legacy_migrations/management/commands/migrate.py	90.90%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
- Coverage   89.50%   86.60%   -2.90%     
==========================================
  Files         324      324              
  Lines       10395    10662     +267     
  Branches     1904     1952      +48     
==========================================
- Hits         9304     9234      -70     
- Misses       1020     1326     +306     
- Partials       71      102      +31     

Flag	Coverage Δ
shared-docker-uploader	?
smart-labels	86.60% <90.90%> (-2.90%)	⬇️

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