Update flash style to "notice" for "setting up test env" message

[donny-wong]

Proposed Changes

Currently, when we display the Autotester message, "Setting up test environment, Please try again later.", the flash styling is on alert-danger. This is actually not an error and it confuses the user thinking something went wrong. Instead we can use the notice alert style.

We had to modify the markus-autotesting component to respond with Http response instead of an exception. So we will need to make sure both these PRs are deployed together at the same time.
PR from markus-autotesting repo: MarkUsProject/markus-autotesting#589

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Screenshots of your changes (if applicable)

Currently, it shows the message as an error message:

This PR will change the message to a notice flash message:

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)
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♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)
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[coveralls]

Pull Request Test Coverage Report for Build 13769772469

Details

• 14 of 16 (87.5%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 91.866%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/javascript/Components/submission_table.jsx	0	2	0.0%

Totals
Change from base Build 13769725436:	0.003%
Covered Lines:	41420
Relevant Lines:	44404

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💛 - Coveralls