porting "Improve parameter and variable names." to 1.7 branch

[vitodb]

This PR ports DE #527 to branch 1.7

Includes:

• Removing the 'schedule' parameter from transform configurations, which no longer require it.

• Making the following changes for the SourceProxy: retries -> max_attempts retry_timeout -> retry_interval

(cherry picked from commit c4fc599723ab1e88d06206c158c346b80f86920e)

[codecov[bot]]

Codecov Report

Merging #585 (9da797d) into 1.7 (55a5b54) will decrease coverage by 0.00%. The diff coverage is 7.14%.

@@            Coverage Diff             @@
##              1.7     #585      +/-   ##
==========================================
- Coverage   83.34%   83.33%   -0.01%     
==========================================
  Files          45       45              
  Lines        2804     2803       -1     
  Branches      454      454              
==========================================
- Hits         2337     2336       -1     
  Misses        427      427              
  Partials       40       40              

Flag	Coverage Δ
python-3.6	83.07% <7.14%> (-0.01%)	:arrow_down:
python-3.9	83.22% <7.14%> (-0.01%)	:arrow_down:

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Impacted Files	Coverage Δ
...rc/decisionengine/framework/modules/SourceProxy.py	0.00% <0.00%> (ø)
...ecisionengine/framework/taskmanager/TaskManager.py	87.94% <100.00%> (-0.05%)	:arrow_down:

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