[MON-22331] [Plugins] Mode sql-string not working anymore

[lucie-dubrunfaut]

Description

Mode sql-string not working anymore because of unescaped literal "{" characters in regular expression patterns are no longer permissible in perl version > 5.26
https://perldoc.perl.org/5.26.0/perldelta

Fixes # (issue)

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

How this pull request can be tested ?

Result was :

perl centreon_plugins.pl --plugin=database::mysql::plugin --mode='sql-string'
Unescaped left brace in regex is passed through in regex; marked by <-- HERE in m/\$self->{ <-- HERE result_values}->{(value_field|key_field)}/ at /home/ldubrunfaut/centreon-plugins/src/centreon/common/protocols/sql/mode/sqlstring.pm line 99.
Unescaped left brace in regex is passed through in regex; marked by <-- HERE in m/\$self->{result_values}->{ <-- HERE (value_field|key_field)}/ at /home/ldubrunfaut/centreon-plugins/src/centreon/common/protocols/sql/mode/sqlstring.pm line 99.
Unescaped left brace in regex is passed through in regex; marked by <-- HERE in m/\%{ <-- HERE (value_field|key_field)}/ at /home/ldubrunfaut/centreon-plugins/src/centreon/common/protocols/sql/mode/sqlstring.pm line 101.
UNKNOWN: Need to specify data_source arguments. 

Result now :

perl centreon_plugins.pl --plugin=database::mysql::plugin --mode='sql-string'
UNKNOWN: Need to specify data_source arguments.