[NEXUS-2423] - Remove Bothub at new projects

[Aldemylla]

Description

Type of Change

• • Bugfix
• • Feature
• • Code style update (formatting, local variables)
• • Refactoring (no functional changes, no api changes)
• • Tests
• • Other

Motivation and Context

To encourage users to use only the agent builder, we decided to remove the bothub module for projects created in 2025 onwards.

Summary of Changes

• Added validation to remove bothub at new projects;
• Added a enviroment variable to allow some projects to use bothub.

Demonstration

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.83%. Comparing base (006928e) to head (c93c65a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #946      +/-   ##
==========================================
+ Coverage   31.79%   31.83%   +0.03%     
==========================================
  Files         175      175              
  Lines       20397    20407      +10     
  Branches      549      553       +4     
==========================================
+ Hits         6486     6496      +10     
  Misses      13911    13911              

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