feat(exec-wasmtime): annotate identity generation errors

[rvolosatovs]

This prevents cryptic

Error: operation failed

failures from occuring, that were encountered during development

[codecov]

Codecov Report

Merging #2497 (c0d697a) into main (a59829c) will decrease coverage by 0.04%.
The diff coverage is 61.76%.

@@            Coverage Diff             @@
##             main    #2497      +/-   ##
==========================================
- Coverage   57.86%   57.82%   -0.04%     
==========================================
  Files         205      205              
  Lines       13387    13455      +68     
==========================================
+ Hits         7746     7781      +35     
- Misses       5641     5674      +33     

Impacted Files	Coverage Δ
crates/exec-wasmtime/src/runtime/mod.rs	100.00% <ø> (ø)
crates/shim-kvm/src/exec.rs	0.00% <0.00%> (ø)
crates/shim-kvm/src/gdt.rs	0.00% <ø> (ø)
crates/shim-kvm/src/interrupts.rs	0.00% <0.00%> (ø)
crates/shim-kvm/src/lib.rs	100.00% <ø> (ø)
src/cli/platform/sgx/crl.rs	4.54% <0.00%> (-1.34%)	⬇️
src/cli/platform/snp/crl.rs	4.54% <0.00%> (-1.34%)	⬇️
src/backend/binary.rs	87.17% <57.89%> (-3.80%)	⬇️
src/backend/kvm/thread.rs	81.21% <61.11%> (-2.35%)	⬇️
src/backend/sev/snp/launch/mod.rs	92.85% <66.66%> (-0.61%)	⬇️
... and 9 more

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