explain limited access if project or customer has team permission

[kevinpapst]

Description

Make sure that the user can identify that the current activity is not accessible to all users, if either its project or customer has teams permissions.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I verified that my code applies to the guidelines (composer code-check)
• I updated the documentation (see here)
• I agree that this code is used in Kimai and will be published under the MIT license

[codecov]

Codecov Report

Merging #2006 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2006   +/-   ##
=========================================
  Coverage     93.38%   93.38%           
  Complexity     5461     5461           
=========================================
  Files           516      516           
  Lines         16762    16762           
=========================================
  Hits          15653    15653           
  Misses         1109     1109           

Impacted Files	Coverage Δ	Complexity Δ
src/Form/Toolbar/ActivityToolbarForm.php	100.00% <ø> (ø)	3.00 <0.00> (ø)