Fixed constantize issue

[saviokmua]

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Description

Describe your changes:

Fixed constantize issue

got #<NoMethodError: undefined method constantize' for MyWorker:Class`

[st0012]

If the class attribute is already a class, then we don't want to re-constantize it.

Suggested change

	klass = payload['class'].to_s.constantize
	klass = payload['class']
	if klass.is_a(String)
	klass = klass.constantize
	end

[codecov]

Codecov Report

Merging #2243 (6d388aa) into master (3377a28) will increase coverage by 0.02%.
Report is 2 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2243      +/-   ##
==========================================
+ Coverage   97.41%   97.43%   +0.02%     
==========================================
  Files         102      102              
  Lines        3823     3825       +2     
==========================================
+ Hits         3724     3727       +3     
+ Misses         99       98       -1     

Components	Coverage Δ
sentry-ruby	98.10% <ø> (+<0.01%)	⬆️
sentry-rails	95.05% <ø> (ø)
sentry-sidekiq	94.70% <ø> (ø)
sentry-resque	93.65% <100.00%> (+1.58%)	⬆️
sentry-delayed_job	95.60% <ø> (ø)
sentry-opentelemetry	100.00% <ø> (ø)

Files	Coverage Δ
sentry-resque/lib/sentry/resque.rb	100.00% <100.00%> (+2.63%)	⬆️

... and 11 files with indirect coverage changes

[st0012]

Thanks for the PR. Is it possible to write a test case for this fix?

[dentarg]

Is it possible to write a test case for this fix?

There are already tests covering this but they are not catching this due to rails being required, I've fixed it in #2248