Fix

• Testing parsing a CSV file with headers that have extra spaces;
• Testing entering a CSV source with extra spaces.

Closes #3153083

added 50 commits

• 6a8c8fe3...dc354618 - 49 commits from branch project:8.x-3.x
• 37a41bf1 - Issue #3153083: Merge latest dev branch and fix conflict.

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added 19 commits

• 37a41bf1...e08bd893 - 18 commits from branch project:8.x-3.x
• 2a8ba860 - Merge branch '8.x-3.x' into 3153083-fix

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added 2 commits

• 2457a368 - Fixed PHPStan issues in tests.
• c7f43227 - Trim CSV column names when entering them on the mapping form and when editing them.

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added 2 commits

• 0de0f0d9 - Added test coverage for configured CSV sources with spaces.
• 7846ccbe - Updated fix for csv parser.

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added 1 commit

• 7b69b868 - Attempt to fix ajax error.

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added 2 commits

• c1233c5a - Fixed single phpcs issue.
• 49acae2e - Add a todo for passing the right form data to a custom source plugin when...

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added 4 commits

• 49acae2e...7bea6300 - 3 commits from branch project:8.x-3.x
• de6882a9 - Merge branch feeds:8.x-3.x into 3153083-fix

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added 1 commit

• 2d8e5260 - Small corrections in tests and in grammar.

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