Ignore case in project/group paths when refreshing agent CI access

What does this MR do and why?

Ignores case when refreshing project/group CI access authorisations. Previously, half of the process was case-insensitive (Routable.where_full_path_in uses LOWER()), which caused an error to be raised when we tried to parse a configuration entry that had incorrect capitalisation.

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How to set up and validate locally

1. Create a test project, my-project
2. Create a file to be used as a sample config file, example.yaml:

ci_access:
   projects:
    - id: UPPERCASE/PATH/TO/YOUR/PROJECT # the path should match, but have the wrong case.
      access_as:
        ci_job: {}

3. From the Rails console:

• create an agent - agent = Clusters::Agents.create!(project: <any project ID>, name: 'test-agent')
• configure the agent with the config file above: - Clusters::Agents::RefreshAuthorizationService.new(agent, config: File.read('example.yaml')).execute

4. NotNullViolation should not be raised

MR acceptance checklist

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

#383325 (closed)