Check for xdebug link format via both ini_get and get_cfg_var
Applyied code review
feature #11378 Allow xdebug.file_link_format from php ini to work when xdebug extension is not loaded (frickenate, ClementGautier)

This PR was merged into the 2.6-dev branch.

Discussion
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Allow xdebug.file_link_format from php ini to work when xdebug extension is not loaded

Q | A
----------------- | ---------------
Bug fix? | yes
New feature? | no
BC breaks? | no
Deprecations? | no
Tests pass? | yes
Fixed tickets | #11081
License | MIT
Doc PR | N/A

Complete the PR https://github.com/symfony/symfony/pull/11081

Commits
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8b2397c Applyied code review
97e07d5 Check for xdebug link format via both ini_get and get_cfg_var