enh(config): add display locked checkbox for objects listing

[cgagnaire]

Description

Add the possibility to display/hide locked commands, service templates and host templates from configuration listings.

See #7264 for screenshots.

Closes: #7264

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

• 2.8.x
• 18.10.x
• 19.04.x
• 19.10.x (master)

How this pull request can be tested ?

Go to those pages :
Host templates : http://fqdn/centreon/main.php?p=60103
Service templates : http://fqdn/centreon/main.php?p=60206
Commands : http://fqdn/centreon/main.php?p=60801

On each pages, tick the "Display locked" checkbox and click on "Search".

Add filters and use pagination.

Checklist

Community contributors & Centreon team

• I 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).

Centreon team only

• I have made sure that the unit tests related to the story are successful.
• I have made sure that unit tests covers 80% of the code written for the story.
• I have made sure that acceptance tests related to the story are successful (local and CI)

[sc979]

As this PR is waiting since a while and the master is now the current 19.04.x maintenance branch; I rebased this dev on it and resolved the conflicts
@lpinsivy -> please don't wait too long to priorize this PR or I'll need to do it again :'(