Feat: adding flexible placement group limit

[avnimish]

📝 Description

This change adds the flexible placement group limit as a field in the PlacementGroupLimits to use when provisioning Placement groups

✔️ How to Test

make TEST_ARGS=-run=TestRegions_pgLimits test-int

[Copilot]

Pull request overview

This pull request extends the RegionPlacementGroupLimits model in the root linodego API client to surface the API’s “flexible placement group” Linode limit returned by the Regions endpoints, and updates unit/integration tests and fixtures accordingly.

Changes:

• Added MaximumLinodesPerFlexiblePG to RegionPlacementGroupLimits with the corresponding JSON field mapping.
• Updated unit fixtures and unit tests to validate the new field is populated.
• Updated the integration TestRegions_pgLimits to assert the new limit is non-zero.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
regions.go	Adds MaximumLinodesPerFlexiblePG to RegionPlacementGroupLimits for Regions API responses.
test/unit/region_test.go	Extends unit assertions to validate MaximumLinodesPerFlexiblePG is present and > 0 when limits exist.
test/unit/fixtures/regions_list.json	Updates the regions list fixture to include maximum_linodes_per_flexible_pg.
test/unit/fixtures/region_get.json	Updates the region get fixture to include maximum_linodes_per_flexible_pg.
test/integration/regions_test.go	Extends the placement-group limits integration test to assert MaximumLinodesPerFlexiblePG is non-zero.

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