Add a configuration property to control max number of studies in study view page

[alisman]

This is enforced only on query page.

It disables the Explore button when more than the limit is reached:

The current limit of 50 is hardcoded in studyLimitedReached method of QueryContainer. We need to link this up with configuration and backend configuration.

• Introduce new configuration property in frontend (with default to 50) (search for enable_cross_study_expression for example in frontend codebase)
• Introduce new configuration property in backend (see Add property to control cross study expression data in frontend #10073 for example

[pvannierop]

@alisman @haynescd Would it be possible to (optionally) limit based on the number of samples/patients that are selected? Or perhaps limit based on the number of studies AND the number of samples? We get this question from clients. The reason for this is poor performce of Study View when selecting too large sample numbers.

[haynescd]

@pvannierop Sounds good. Will incorporate