fix(core): preserve multi-chain getClient action typing

[fuyua9]

Summary

• add a type regression covering waitForTransactionReceipt(getClient(config), ...) with a multi-chain config
• preserve the full multi-chain action client type by avoiding distributive conditional behavior in GetClientReturnType

Testing

• pnpm bench:types packages/core/src/actions/getClient.test-d.ts

Closes #3635

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[changeset-bot]

🦋 Changeset detected

Latest commit: ece6a1d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@wagmi/core	Patch
@wagmi/connectors	Patch
wagmi	Patch
@wagmi/solid	Patch
@wagmi/vue	Patch

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[fuyua9]

Added a patch changeset for @wagmi/core in ece6a1d so the changeset bot can classify this getClient typing fix for release.

Local validation: git diff --check passed. I did not rerun the full type suite here because this follow-up only adds a changeset file and the worktree did not have dependencies installed.

[tmm]

Closing as a duplicate of #5136, which includes the same getClient typing fix with broader coverage. Thanks for the PR!