Refactor: Project Samples Test

[ChrisHuynh333]

What does this PR do and why?

This PR refactors system/projects/samples_test.rb.

Upon revision, there were many aspects of the testing file that needed cleanup and/or fixing.
This is including but not limited to:

1. Ensuring assertions are actually testing what the test title states
2. Removing redundancies between tests (eg: no need to check for a header every time we visit a page unless we're testing a redirect). Note: There are cases where tests are flaky, and the resolution is to add additional asserts (such as anything with select2). These cases will have repetitive assertions and should be commented on.
3. Split larger tests into multiple tests so tests are shorter and more focused.
4. Use of ID selectors as much as possible

Screenshots or screen recordings

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How to set up and validate locally

1. Verify tests pass locally

PR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the PR acceptance checklist for this PR.

[github-actions]

Code Metrics Report

Coverage	Test Execution Time
92.6%	10m42s

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Reported by octocov