Remove getCacheKey() and getCacheTag() from Schema

[Tigrov]

Related PR

• Add getCacheKey() and getCacheTag() to AbstractPdoSchema db#943

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.88%. Comparing base (5d48408) to head (a5d7d51).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #396      +/-   ##
============================================
- Coverage     99.88%   99.88%   -0.01%     
+ Complexity      274      272       -2     
============================================
  Files            33       33              
  Lines           844      840       -4     
============================================
- Hits            843      839       -4     
  Misses            1        1              

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