EVEREST-778: fix everest URL construction

[michal-kralik]

CHANGE DESCRIPTION

Problem: EVEREST-778

When Everest URL ends with a slash, some non-GET endpoints return an error.

Cause: The Everest URL is not constructed properly and has a double slash.

Solution: Construct Everest URL CHECKLIST

Jira

• [x] Is the Jira ticket created and referenced properly?

Tests

• [ ] Is an Integration test/test case added for the new feature/change?
• [ ] Are unit tests added where appropriate?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (01656ba) 5.33% compared to head (043cf84) 5.33%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #270 +/- ## ===================================== Coverage 5.33% 5.33% ===================================== Files 13 13 Lines 2850 2850 ===================================== Hits 152 152 Misses 2671 2671 Partials 27 27 ```

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