Refactor envelope metadata usage

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Tests pass?	✔️

[codecov]

Codecov Report

❌ Patch coverage is 0% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (ef2dd9e) to head (b4aad63).

Files with missing lines	Patch %	Lines
src/Middleware/FailureHandling/FailureEnvelope.php	0.00%	20 Missing ⚠️
src/Queue.php	0.00%	8 Missing ⚠️
src/Exception/MessageFailureException.php	0.00%	6 Missing ⚠️
...rc/Middleware/Push/Implementation/IdMiddleware.php	0.00%	5 Missing ⚠️
...ling/Implementation/ExponentialDelayMiddleware.php	0.00%	4 Missing ⚠️
src/Worker/Worker.php	0.00%	4 Missing ⚠️
src/Message/IdEnvelope.php	0.00%	3 Missing ⚠️
...ureHandling/Implementation/SendAgainMiddleware.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             master    #293   +/-   ##
========================================
  Coverage      0.00%   0.00%           
- Complexity      320     330   +10     
========================================
  Files            49      49           
  Lines           879     905   +26     
========================================
- Misses          879     905   +26     

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