User Analytics API returns inconsistent data types & static month-based assertions cause test failures

[idehen-divine]

The user-analytics API returns monetary values as strings instead of floats, which causes assertion failures in tests. Additionally, the test expects static month-based values, making it unreliable across different months.

Steps to Reproduce:

1. Run the test at different times of the year.
2. The test expects hardcoded values for Jul and Aug, while Carbon::now()->subMonth() makes the expected values dynamic.
3. The API returns amounts as "2000.00" (string) instead of 2000.00 (float), leading to assertion mismatches.

Expected Behavior:

The API should return monetary values as floats to ensure type consistency.
Tests should dynamically determine expected months based on the current date.

Actual Behavior:

The API response includes strings for numerical values.
The test fails when run in a different month due to hardcoded expectations.

[bhimbho]

test has been fixed here #625