Add XCMP Remark Test and Update Build Workflow

[asiniscalchi]

PR Type

tests, enhancement

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Description

• Added a new test xcmp_remark_para_b to verify the XCMP remark functionality between parachains.
• Updated the GitHub Actions build workflow to use the --locked flag during testing, ensuring locked dependencies.
• Modified the metadata15.golden file to reflect a change in the metadata value.

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Changes walkthrough 📝

	Relevant files
Tests	laosish_xcm.rs Add XCMP remark test for parachains                                            xcm-simulator/src/tests/laosish_xcm.rs Added a new test xcmp_remark_para_b to verify XCMP remark functionality. The test sends a remark from one parachain to another and checks for the event. +28/-0
Configuration changes	build.yml Update build workflow to use locked dependencies                  .github/workflows/build.yml Modified the test command to include the --locked flag. +1/-1
Miscellaneous	metadata15.golden Update metadata golden file                                                            runtime/laos/src/tests/metadata15.golden Updated a value in the metadata file from 244 to 245. +1/-1

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[asiniscalchi]

/describe

[github-actions]

PR Description updated to latest commit (149c474)

[asiniscalchi]

/describe

[github-actions]

PR Description updated to latest commit (5b8521b)