feat(producer): partition muting for msg ordering

[3AceShowHand]

When MaxOpenRequests > 1, mute partitions with in-flight batches to prevent out-of-order delivery during retries.

This PR backports the producer ordering fix from IBM/sarama#3422 onto v1.41.2-pingcap, and keeps go.mod on go 1.25.0.

Upstream references and why these changes are needed

• IBM/sarama#3422 feat(producer): partition muting for msg ordering

  • commits:
    • 8d3ebceafc333a42f6783d43588adbef90a1649a feat(producer): partition muting for msg ordering
    • 2a3604789240d5162e739468bd9db362bf60d69f fix(test): retry GetOffset on leader electio
    • 29f83cada48f1cba691de9738c14a6399bb3875b fix: simplify muter helpers
  • needed because this is the actual producer ordering fix we want to merge. Cherry-picking it incompletely leaves the old branch with missing code/test pieces, and CI stops before the feature can be validated.

• IBM/sarama#3047 commit ab8a26611e8a7f08991d06d7d919a88682583221 fix(test): refactor helpers into common files

  • needed because v1.41.2-pingcap does not have the shared test helpers that the newer IBM tests rely on (appendInterceptor, closeProducer*, TestMessage). Without backfilling them, the #3422 tests do not compile.

• IBM/sarama#3026 and IBM/sarama#3088

  • commits:
    • 7c75cc4 feat(producer): add retry buffer tuning option to prevent OOM
    • 26d7c7b51699274209b0b106a3d896377d8cc5f1 feat(producer): add MaxBufferBytes to limit retry buffer size
  • needed because the older pingcap branch does not contain Producer.Retry.MaxBufferLength / Producer.Retry.MaxBufferBytes, while the newer IBM producer/test code assumes that configuration surface exists.

• IBM/sarama#3113 commit 4979ecefa0793ca59733b054a8af1038dc6be220 chore: bump minimum Go version to 1.23.0

  • needed as the upstream CI pattern for newer Go directives: once go.mod is go 1.25.0, running CI with 1.17.x / 1.20.x / 1.21.x fails immediately on the go directive/toolchain check. Switching unit/FVT workflows to stable / oldstable and setting GOTOOLCHAIN: local is required to make CI compatible with Go 1.25.

• IBM/sarama#3160 commit 4d2b166e5c2770f6b23f83eab587d7801878d429 fix(ci): bump golangci-lint to v2

  • needed because the old .golangci.yml format is not compatible with the newer golangci-lint releases required for Go 1.25 support.

• IBM/sarama#3400 commit 265af947 chore(deps): update golangci/golangci-lint-action action to v9.2.0

  • needed to align the GitHub Action wrapper with the upstream-supported lint stack.

• IBM/sarama#3482 commit 52f24214 chore(deps): update dependency golangci/golangci-lint to v2.11.4

  • needed because older golangci-lint versions on this branch do not support Go 1.25 correctly.

• IBM/sarama#3453 commit d4862ce chore(deps): bump golang.org/x/net from 0.50.0 to 0.51.0 in the golang-x group across 1 directory

  • relevant because upstream main is already on go 1.25.0; this PR aligns the pingcap branch CI/tooling with that upstream state instead of downgrading the module directive.

Backport-specific notes

• This maintenance branch is older than the IBM baseline used by the PRs above, so a few minimal branch-local lint/test cleanups are included to make go test and golangci-lint pass under Go 1.25. These are compatibility adjustments for the backport, not new behavior changes.