fix(partition): fix partengine regex

[s-duret]

Description

When running the cron script to create the partitions (/usr/share/centreon/cron/centreon-partitioning.php) there is an error saying that the partition already exists:

Error: cannot add a new partition 'p20220126' for table centreon_storage.data_bin, SQLSTATE[HY000]: General error: 1517 Duplicate partition name p20220126

This is fixed on the regex that has extra backticks and does not recognize properly the values for the last created partition.

Fixes #10265

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software
• Updating documentation (missing information, typo...)

Target serie

• 20.10.x
• 21.04.x
• 21.10.x
• 22.04.x (master)

How this pull request can be tested ?

Please describe the procedure to verify that the goal of the PR is matched. Provide clear instructions so that it can be correctly tested.

Any relevant details of the configuration to perform the test should be added.

Checklist

• I have followed the coding style guidelines provided by Centreon
• I have commented my code, especially new classes, functions or any legacy code modified. (docblock)
• I have commented my code, especially hard-to-understand areas of the PR.
• I have made corresponding changes to the documentation.
• I have rebased my development branch on the base branch (master, maintenance).

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