fix: templates errors

[AlexD10S]

Closes #323. For the contract_template's cross-contract-calls, it was necessary to rename e2e_tests.rs to match the user-defined input name. Without this adjustment, the e2e tests would fail due to the file not being correctly recognized.

Closes #321 using the PSP34 managed by R0gue: https://github.com/r0gue-io/PSP34

[codecov]

Codecov Report

Attention: Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.37%. Comparing base (2af82eb) to head (e2b0cf0).

Files with missing lines	Patch %	Lines
crates/pop-contracts/src/new.rs	88.00%	0 Missing and 3 partials ⚠️

@@            Coverage Diff             @@
##             main     #329      +/-   ##
==========================================
+ Coverage   70.33%   70.37%   +0.03%     
==========================================
  Files          53       53              
  Lines        9098     9123      +25     
  Branches     9098     9123      +25     
==========================================
+ Hits         6399     6420      +21     
  Misses       1718     1718              
- Partials      981      985       +4     

Files with missing lines	Coverage Δ
crates/pop-contracts/src/templates.rs	98.24% <100.00%> (ø)
crates/pop-contracts/src/new.rs	82.38% <88.00%> (+0.92%)	⬆️

... and 1 file with indirect coverage changes