fix(tests): handle return collateral validation in build

[mkoura]

Cardano-api >= 11.4.0.0 (bundled with the node 11.1.0 release) fixes issue #1261: transaction build now validates that the return collateral output meets the min UTxO value.

Rework test_minting_with_small_return_collateral:

• When the too small return collateral output is specified explicitly, expect transaction build to fail.
• When it is not specified explicitly, the command omits the return collateral output and uses the whole collateral input as total collateral. Verify that and check the token was minted.
• Keep backwards compatibility: on older versions the build succeeds and submit fails with BabbageOutputTooSmallUTxO, xfailed via the api_1261 blocker.

The discrimination is behavior-driven rather than version-based, as cardano-cli 11.1.0.0 exists with both pre-fix and post-fix cardano-api. Structural asserts are kept outside allow_unstable_error_messages() so unrelated errors cannot be silently converted to pass or xfail.

Also update api_1261 fixed_in to the actual node release 11.1.0.

[Copilot]

Pull request overview

Updates the Plutus V2 negative minting test to reflect the newer cardano-cli transaction build behavior that validates return-collateral min-UTxO when explicitly provided, while keeping behavior-driven compatibility with older node/cardano-api combinations.

Changes:

• Reworked test_minting_with_small_return_collateral to distinguish:
  • explicit too-small return collateral (expect build failure on newer versions), vs
  • implicit return collateral (expect omission + full collateral used + successful mint on newer versions), vs
  • legacy behavior (expect submit failure with BabbageOutputTooSmallUTxO, gated via api_1261).
• Added optional transaction view structural verification (skipped on Dijkstra where not supported).
• Updated api_1261 blocker metadata to mark the fix as bundled with node 11.1.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cardano_node_tests/tests/tests_plutus_v2/test_mint_negative_build.py	Reworks the negative minting test to handle new/old behaviors around return-collateral min-UTxO validation and verifies success-path collateral semantics + mint result.
cardano_node_tests/tests/issues.py	Updates api_1261.fixed_in to 11.1.0 to match the node release that bundles the fix.

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