fix: DEV-2309: don't show the delete all region button when annotation is readonly

[bmartel]

No description provided.

[bmartel]

/frontend build lsf master

Successfully pushed new changes
HumanSignal/label-studio-frontend@ed8a590

Workflow run

[Travis1282]

/git merge develop

'/git' is unknown command.
See '/help'

[codecov]

Codecov Report

Merging #2515 (603404c) into develop (17b40da) will decrease coverage by 0.19%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2515      +/-   ##
===========================================
- Coverage    77.80%   77.60%   -0.20%     
===========================================
  Files          137      141       +4     
  Lines         9951    10229     +278     
===========================================
+ Hits          7742     7938     +196     
- Misses        2209     2291      +82     

Impacted Files	Coverage Δ
label_studio/label_studio/users/mixins.py	75.00% <0.00%> (-12.50%)	⬇️
...bel_studio/label_studio/organizations/functions.py	66.66% <0.00%> (-10.26%)	⬇️
...l_studio/label_studio/core/templatetags/filters.py	48.75% <0.00%> (-6.20%)	⬇️
label_studio/label_studio/users/forms.py	87.09% <0.00%> (-2.38%)	⬇️
label_studio/label_studio/tasks/serializers.py	84.27% <0.00%> (-2.27%)	⬇️
label_studio/label_studio/tasks/models.py	87.85% <0.00%> (-2.20%)	⬇️
...abel_studio/label_studio/data_manager/functions.py	64.70% <0.00%> (-1.97%)	⬇️
label_studio/label_studio/core/label_config.py	71.54% <0.00%> (-1.85%)	⬇️
label_studio/label_studio/data_manager/managers.py	80.17% <0.00%> (-1.54%)	⬇️
.../label_studio/data_manager/actions/experimental.py	18.62% <0.00%> (-0.89%)	⬇️
... and 40 more

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