WD-8398 - View secret contents

[huwshimi]

Done

• Fetch and display secret contents in a modal.

QA

• Go to the secrets tab.
• Click the eye next to a secret.
• Choose a revision and click "View"
• The secret contents should be displayed.

Details

https://warthogs.atlassian.net/browse/WD-8398

[webteam-app]

Demo starting at https://juju-dashboard-1707.demos.haus

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (adc004c) 95.27% compared to head (7afe76d) 95.44%. Report is 2 commits behind head on main.

Files	Patch %	Lines
...ails/Model/Secrets/SecretContent/SecretContent.tsx	94.73%	1 Missing and 1 partial :warning:
...components/secrets/RevisionField/RevisionField.tsx	85.71%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1707 +/- ## ========================================== + Coverage 95.27% 95.44% +0.17% ========================================== Files 185 187 +2 Lines 5455 5596 +141 Branches 1581 1616 +35 ========================================== + Hits 5197 5341 +144 + Misses 239 235 -4 - Partials 19 20 +1 ```

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