Fix benchmark/compile.py nested f-string and deprecated constant issues (#6773)

This commit resolves three issues in the benchmark script:
1. Fixed nested f-string syntax error that was causing CI failures (fixes #6772)
2. Fixed key access error handling for timing dictionary

The nested f-string was causing a syntax error in CI, and the proper fix is to
create the key variable separately before using it. Also improved error handling
for cases where compilation fails and timing data might be missing.

Fixes: #6772

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