Added test metadata examples to seed data for R autotesting

[david-yz-liu]

Proposed Changes

(Describe your changes here. Also describe the motivation for your changes: what problem do they solve, or how do they improve the application or codebase? If this pull request fixes an open issue, use a keyword to link this pull request to the issue.)

This PR modifies the autotesting seed data to illustrate how R unit tests can be used to store MarkUs-related metadata. The key example is here:

  exp_signal(new_expectation(
    type = "success",
    message = "",
    markus_overall_comments = "This is an overall comment. Great job!",
    markus_tag = "good",
    markus_annotation = list(
      filename = "submission.R",
      content = "This function should not be used",
      line_start = 5,
      line_end = 5,
      column_start = 2,
      column_end = 6
    )
  ))

This new functionality relies on the autotesting change in MarkUsProject/markus-autotesting#615.

Screenshots of your changes (if applicable)

Associated documentation repository pull request (if applicable)

Type of Change

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Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)	X

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[coveralls]

Pull Request Test Coverage Report for Build 15736176438

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.993%

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Totals
Change from base Build 15734387666:	0.0%
Covered Lines:	41973
Relevant Lines:	44944

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💛 - Coveralls