[Breaking Change] Migrate load balancer session_affinity_attributes from TypeMap to TypeSet

[tc80]

Context: #1954 (comment)

Migrate load balancer session_affinity_attributes from TypeMap to TypeSet so that we can get rid of the custom template.

Also, note that the session_affinity_attributes property drain_duration is now a TypeInt instead of a TypeString (since previously all of the TypeMap elements needed to be the same type — TypeString).

[github-actions]

changelog detected ✅

[github-actions]

Marking this pull request as stale due to 14 days of inactivity. This helps our maintainers find and focus on the active pull requests. If this pull request receives no comments in the next 7 days it will automatically be closed. Maintainers can also remove the lifecycle/stale label.
If this pull request was automatically closed and you feel this pull request should be reopened, we encourage creating a new pull request linking back to this one for added context. Thank you!

[github-actions]

Marking this pull request as stale due to 14 days of inactivity. This helps our maintainers find and focus on the active pull requests. If this pull request receives no comments in the next 7 days it will automatically be closed. Maintainers can also remove the lifecycle/stale label.
If this pull request was automatically closed and you feel this pull request should be reopened, we encourage creating a new pull request linking back to this one for added context. Thank you!

[jacobbednarz]

acceptance tests are all good on 4.x

TF_ACC=1 go test ./internal/sdkv2provider -v -run "^TestAccCloudflareLoadBalancer_" -count 1 -parallel 1 -timeout 120m -parallel 1
=== RUN   TestAccCloudflareLoadBalancer_Import
=== PAUSE TestAccCloudflareLoadBalancer_Import
=== RUN   TestAccCloudflareLoadBalancer_Basic
=== PAUSE TestAccCloudflareLoadBalancer_Basic
=== RUN   TestAccCloudflareLoadBalancer_SessionAffinity
=== PAUSE TestAccCloudflareLoadBalancer_SessionAffinity
=== RUN   TestAccCloudflareLoadBalancer_AdaptiveRouting
=== PAUSE TestAccCloudflareLoadBalancer_AdaptiveRouting
=== RUN   TestAccCloudflareLoadBalancer_LocationStrategy
=== PAUSE TestAccCloudflareLoadBalancer_LocationStrategy
=== RUN   TestAccCloudflareLoadBalancer_RandomSteering
=== PAUSE TestAccCloudflareLoadBalancer_RandomSteering
=== RUN   TestAccCloudflareLoadBalancer_GeoBalanced
=== PAUSE TestAccCloudflareLoadBalancer_GeoBalanced
=== RUN   TestAccCloudflareLoadBalancer_ProximityBalanced
=== PAUSE TestAccCloudflareLoadBalancer_ProximityBalanced
=== RUN   TestAccCloudflareLoadBalancer_Rules
=== PAUSE TestAccCloudflareLoadBalancer_Rules
=== RUN   TestAccCloudflareLoadBalancer_DuplicatePool
=== PAUSE TestAccCloudflareLoadBalancer_DuplicatePool
=== RUN   TestAccCloudflareLoadBalancer_Update
=== PAUSE TestAccCloudflareLoadBalancer_Update
=== RUN   TestAccCloudflareLoadBalancer_CreateAfterManualDestroy
=== PAUSE TestAccCloudflareLoadBalancer_CreateAfterManualDestroy
=== CONT  TestAccCloudflareLoadBalancer_Import
--- PASS: TestAccCloudflareLoadBalancer_Import (14.27s)
=== CONT  TestAccCloudflareLoadBalancer_GeoBalanced
--- PASS: TestAccCloudflareLoadBalancer_GeoBalanced (11.65s)
=== CONT  TestAccCloudflareLoadBalancer_CreateAfterManualDestroy
--- PASS: TestAccCloudflareLoadBalancer_CreateAfterManualDestroy (18.33s)
=== CONT  TestAccCloudflareLoadBalancer_Update
--- PASS: TestAccCloudflareLoadBalancer_Update (18.35s)
=== CONT  TestAccCloudflareLoadBalancer_DuplicatePool
--- PASS: TestAccCloudflareLoadBalancer_DuplicatePool (5.98s)
=== CONT  TestAccCloudflareLoadBalancer_Rules
--- PASS: TestAccCloudflareLoadBalancer_Rules (10.72s)
=== CONT  TestAccCloudflareLoadBalancer_ProximityBalanced
--- PASS: TestAccCloudflareLoadBalancer_ProximityBalanced (10.35s)
=== CONT  TestAccCloudflareLoadBalancer_AdaptiveRouting
--- PASS: TestAccCloudflareLoadBalancer_AdaptiveRouting (11.23s)
=== CONT  TestAccCloudflareLoadBalancer_RandomSteering
--- PASS: TestAccCloudflareLoadBalancer_RandomSteering (11.68s)
=== CONT  TestAccCloudflareLoadBalancer_LocationStrategy
--- PASS: TestAccCloudflareLoadBalancer_LocationStrategy (12.93s)
=== CONT  TestAccCloudflareLoadBalancer_SessionAffinity
--- PASS: TestAccCloudflareLoadBalancer_SessionAffinity (23.46s)
=== CONT  TestAccCloudflareLoadBalancer_Basic
--- PASS: TestAccCloudflareLoadBalancer_Basic (11.95s)
PASS
ok  	github.com/cloudflare/terraform-provider-cloudflare/internal/sdkv2provider	161.509s

[github-actions]

This functionality has been released in v4.0.0 of the Terraform Cloudflare Provider.

Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!