Add support for CompositePrimaryKey in inspectdb

[Jacob Walls]

We can now replace the ​half-measure created when introspecting a composite primary key with the actual field.

​PR

[Sarah Boyce <42296566+sarahboyce@…>]

In a8e4fd11:

Fixed #36052 -- Supported CompositePrimaryKey in inspectdb.

[nessita <124304+nessita@…>]

In 4c758581:

Refs #36052, #32234 -- Removed create_test_table_with_composite_primary_key flag in favor of using CompositePrimaryKey.

Now that Django properly supports creating models with composite primary
keys, the tests should use a CompositePrimaryKey field instead of a
feature flag to inline backend specific SQL for creating a composite PK.

Specifcially, the inspectdb's test_composite_primary_key was adjusted to
use schema editor instead of per-backend raw SQL.

[Natalia <124304+nessita@…>]

In 5d03c71b:

[5.2.x] Refs #36052, #32234 -- Removed create_test_table_with_composite_primary_key flag in favor of using CompositePrimaryKey.

Now that Django properly supports creating models with composite primary
keys, the tests should use a CompositePrimaryKey field instead of a
feature flag to inline backend specific SQL for creating a composite PK.

Specifcially, the inspectdb's test_composite_primary_key was adjusted to
use schema editor instead of per-backend raw SQL.

Backport of 4c75858135589f3a00e32eb4d476074536371a32 from main.

[GitHub <noreply@…>]

In dd133054:

Refs #36052, #32234 -- Fixed inspectdb tests for CompositePrimaryKey on Oracle.

Tests regression in 4c75858135589f3a00e32eb4d476074536371a32.

[Mariusz Felisiak <felisiak.mariusz@…>]

In 44bda7a6:

[5.2.x] Refs #36052, #32234 -- Fixed inspectdb tests for CompositePrimaryKey on Oracle.

Tests regression in 4c75858135589f3a00e32eb4d476074536371a32.
Backport of dd133054cb98f77577c06d7ef1f2391a865784bc from main