fix: context provider's ignoreErrorOnMissingContext parameter is misleading

[rix0rrr]

In ContextProvider.getValue(), ignoreErrorOnMissingContext is a request to the CLI's context provider to not fail the lookup, but return the dummy value instead.

The operation doesn't have anything to do with missing context, and missing context isn't an error. Deprecate that parameter and add ignoreFailedLookup instead.

Also explain the dummyValue field and this one a bit better.

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Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.36%. Comparing base (2dc5d70) to head (100e16b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #33875      +/-   ##
==========================================
- Coverage   82.38%   82.36%   -0.03%     
==========================================
  Files         120      120              
  Lines        6938     6940       +2     
  Branches     1170     1171       +1     
==========================================
  Hits         5716     5716              
- Misses       1119     1120       +1     
- Partials      103      104       +1     

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packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.36% <0.00%> (-0.03%)	⬇️

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[mrgrain]

ignoreFailedLookup

vs.

The dummy value should not be returned for all SDK lookup failures. For example, "no network" or "no credentials" or "malformed query" should not lead to the dummy value being returned. Only the case of "no such resource" should.`

Why not call it ignoreResourceNotFound (or similar) then?

And then because ignore always implies you know what the standard behavior is, we might be better off calling it failOnResourceNotFound (with a value defaulting to true). Or even something like mustReturnResource.