[global-search] add doc check for route

[fix][test-case] filter sanitizer

courtesy: @netchanpfaris
initally the regex used to allow only digits 0-9, not it considers the
entire number range

[Security][fix] To avoid possible sql injection via filters and or_filters parameters and tighten the field level checks (#5721)

* [fix] sanitize filters and or_filters to avoid sql injection

* add test cases for filter sanitizer

* codacy fix

* added test cases to test valid scenarios

* [security][fix] Sanitize search fields to avoid sql injection

* Test Cases for Sanitizer

* Test Cases fix

* [fix] test case

[global-search] trim varchar columns

[fix] for mariadb version 10.3

new app creation fix

If there are multiple Email Accounts with the same append_to,
then the first one is fetched which is incorrect if there is an
Email Account for the current user.

Now it is first filtered by email_id, if not found falls back to old
behaviour.

- remove unused nightwatch
- update less to 3.0.4

Updated Issues and PR Templates

* handle the int overflow

 - convert the int to the bigint if the length is more than 11

* proper formatting

* Jinja Customization from hooks.py bug fix

* Condition to check for site initialization added.