[fix] #2081: Fix the test case to grant the role

[s8sato]

Description of the Change

• Edit register_metadata_role test to represent Register a role and grant it to an account #2081 case, renaming to register_and_grant_role_for_metadata_access

Issue

• Describes Register a role and grant it to an account #2081

Benefits

• Prevent regressions in the future
• Show a minimum example of how to grant roles

Possible Drawbacks

None

[codecov]

Codecov Report

Merging #2312 (11b2bc4) into iroha2-dev (6973f71) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@              Coverage Diff               @@
##           iroha2-dev    #2312      +/-   ##
==============================================
- Coverage       65.50%   65.43%   -0.07%     
==============================================
  Files             133      133              
  Lines           24697    24720      +23     
==============================================
- Hits            16177    16176       -1     
- Misses           8520     8544      +24     

Impacted Files	Coverage Δ
client/src/client.rs	44.04% <0.00%> (-0.81%)	⬇️
core/src/smartcontracts/isi/mod.rs	52.45% <0.00%> (-0.14%)	⬇️
core/src/smartcontracts/isi/world.rs	9.52% <0.00%> (+0.43%)	⬆️
data_model/src/query.rs	39.34% <0.00%> (-1.90%)	⬇️
tools/kura_inspector/src/print.rs	96.15% <0.00%> (-0.77%)	⬇️

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[Arjentix]

Though I don't think it closes the issue, cause I think SDK-developers still getting their error and we need to help them