Inline model types for migrations

[6543]

to not have side effects on migration if refactoring is done, all type definitions should be declared within the migration.

this is already done but in-lining even isolates the types between migrations itself.

and as shown by the refactor the where already missuses sometimes, this fixes this.

[codecov]

Codecov Report

Attention: Patch coverage is 94.00749% with 16 lines in your changes missing coverage. Please review.

Project coverage is 27.06%. Comparing base (066926f) to head (6f4d3f4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...re/datastore/migration/000_legacy_to_xormigrate.go	0.00%	5 Missing ⚠️
server/store/datastore/migration/001_add_org_id.go	88.23%	0 Missing and 2 partials ⚠️
...re/migration/004_remove_secrets_plugin_only_col.go	88.88%	0 Missing and 1 partial ⚠️
...ation/005_convert_to_new_pipeline_errors_format.go	94.11%	0 Missing and 1 partial ⚠️
...datastore/migration/007_clean_registry_pipeline.go	93.33%	0 Missing and 1 partial ⚠️
...re/datastore/migration/008_set_default_forge_id.go	50.00%	0 Missing and 1 partial ⚠️
...re/datastore/migration/009_unify_columns_tables.go	99.41%	0 Missing and 1 partial ⚠️
...e/datastore/migration/012_rename_start_end_time.go	87.50%	0 Missing and 1 partial ⚠️
...er/store/datastore/migration/015_add_org_agents.go	87.50%	0 Missing and 1 partial ⚠️
...astore/migration/016_add_custom_labels_to_agent.go	83.33%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4293      +/-   ##
==========================================
+ Coverage   26.53%   27.06%   +0.53%     
==========================================
  Files         379      379              
  Lines       27555    27753     +198     
==========================================
+ Hits         7311     7512     +201     
+ Misses      19575    19572       -3     
  Partials      669      669              

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[woodpecker-bot]

Tearing down https://woodpecker-ci-woodpecker-pr-4293.surge.sh