Improve input validation

[evegufy]

Description

Validate the input (especially urls) being passed and omit those that use a different protocol than https, contain query or fragment or navigational elements (like '../..') in the path

Also make sure that the application does convert "dangerous" characters into safe equivalents (HTML entities or Unicode characters)

Examples of dangerous characters:
< >
Introduction of HTML or JavaScript code tags
' " &
Manipulating the content of SQL queries
{ } $ %
Embedding executable code in HTML server templates

Additionally, look into restricting the number of files that can be uploaded by the user.

Important: needs to be approached jointly with eclipse-tractusx/portal-frontend#672

[jjeroch]

Important: this should only happen jointly with the FE team - the backend team was already tasked to update the pattern in the last sprint review and to make sure that it fits with FE validations.
To ensure a synchronized implementation it is important to implement this task with a frontend developer jointly and to touch all the respective sections/endpoints where urls are entered
FE Task: eclipse-tractusx/portal-frontend#672

[MaximilianHauer]

based on discussion wiht @oyo and @Phil91 we dont need this as html/sql syntax will not be executed due to frontend configuration