fix: replace OAF part 1 property filter wildcard (*) in datasource layer

[rkettelerij]

Description

fix: replace OAF part 1 property filter wildcard (*) in datasource layer instead of during URL validation to prevent side-effects in frontend.

Semi-related, also reported: opengeospatial/ogcapi-features#1059

Type of change

• Bugfix

Checklist:

• I've double-checked the code in this PR myself
• I've left the code better than before (boy scout rule)
• The code is readable, comments are added that explain hard or non-obvious parts.
• I've expanded/improved the (unit) tests, when applicable
• I've run (unit) tests that prove my solution works
• There's no sensitive information like credentials in my PR