[MTV-1786] Add tooltip to Create plan wizard's Target namespace field

[jpuzz0]

https://issues.redhat.com/browse/MTV-1786

Summary

• Added tooltip with text shared in this design JIRA:
  https://issues.redhat.com/browse/HPUX-228
• Added common component for help icons with popovers. Can make a separate task to convert several repeated instances of using the same help icon popover soon if this is acceptable.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.21%. Comparing base (13484d0) to head (f5e85a0).
Report is 152 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1410      +/-   ##
==========================================
- Coverage   36.81%   36.21%   -0.60%     
==========================================
  Files         158      159       +1     
  Lines        2548     2579      +31     
  Branches      599      601       +2     
==========================================
- Hits          938      934       -4     
- Misses       1428     1630     +202     
+ Partials      182       15     -167     

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[yaacov]

nice