IT: Support `#ignore = reason` for `test_runtimes` macro

[lemunozm]

Description

Gives support to ignore tests in integration tests with the #[test_runtimes()] macro.

Using ignore instead of commenting the test helps to not forget and leave the test commented when it could be fixed.

Now:

#[test_runtimes([development, altair, centrifuge], ignore)]
// or
#[test_runtimes([development, altair, centrifuge], ignore = "reason")]

NOTE: useful to work smoothly in the lpv2 branch when solidity/centrifuge-chain don't match correctly.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 46.31%. Comparing base (2c1be11) to head (fb1f8de).

Files	Patch %	Lines
runtime/integration-tests/procedural/src/lib.rs	0.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1908 +/- ## ======================================= Coverage 46.31% 46.31% ======================================= Files 179 179 Lines 13076 13081 +5 ======================================= + Hits 6056 6059 +3 - Misses 7020 7022 +2 ```

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[lemunozm]

Fixed clippy, can I have a reapproval? @wischli