Refactor/test

[Patrik-Stas]

• simplify implementation of create_and_write_test_schema
• consequently get_schema_attrs became dead code, deleted that and associated test
• removed libvcx test create_revocable_cred_def_and_check_tails_location and assured equivalent assert in existing aries-vcx test test_pool_get_rev_reg
• rename create_and_write_test_rev_reg to create_and_publish_test_rev_reg

[codecov-commenter]

Codecov Report

Merging #995 (1f9101e) into main (77c8d8f) will decrease coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is 80.95%.

❗ Current head 1f9101e differs from pull request most recent head c9d9c13. Consider uploading reports for the commit c9d9c13 to get more accurate results

@@            Coverage Diff             @@
##             main     #995      +/-   ##
==========================================
- Coverage   30.38%   30.38%   -0.01%     
==========================================
  Files         422      422              
  Lines       26248    26281      +33     
  Branches     5085     5091       +6     
==========================================
+ Hits         7975     7985      +10     
- Misses      16055    16070      +15     
- Partials     2218     2226       +8     

Flag	Coverage Δ
unittests-aries-vcx	30.38% <80.95%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
aries_vcx/src/common/anoncreds.rs	82.88% <100.00%> (ø)
aries_vcx/src/common/credentials/mod.rs	81.81% <100.00%> (ø)
aries_vcx/tests/test_proof_presentation.rs	86.36% <100.00%> (ø)
...s_vcx/tests/utils/scenarios/credential_issuance.rs	84.68% <100.00%> (ø)
aries_vcx/src/common/test_utils.rs	94.11% <90.00%> (-0.14%)	⬇️
aries_vcx/tests/test_pool.rs	85.11% <66.66%> (-0.19%)	⬇️
...ies_vcx/src/common/primitives/credential_schema.rs	17.18% <33.33%> (+5.60%)	⬆️