symfony

This PR was squashed before being merged into the 2.7 branch (closes #22232).

Discussion
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CS: Remove invisible chars

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | n/a
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

I found out that we have 2 non-visible in regular IDE chars in codebase.
One is just inside a comment, it could be safely removed.
But second is inside a real code, I have replaced it with `pack`, so one won't accidentally replace non-breaking space with regular space.

Commits
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0f623f42 CS: Remove invisible chars