[Testing] Reduce tensornet test time in explicit measurement tests

[1tnguyen]

These dynamics circuits require incremental contractions (in the n_rounds loop), hence are very slow on tensornet backends.

Use the test macro to reduce the number of rounds/shots for tensornet backends.

With 4 tensor network backends (full tensor network/MPS for single/double precision) x 2 tests, the test time reduction (for developers) is quite significant (~1000 secs)

[github-actions]

CI Summary — ✅ passed

Run #25230306683 · trigger push · ✅ 6 · ⏩ 7 · ❌ 0 · ⛔ 0

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Job	Result
binaries	⏩ skipped
build_and_test	✅ success
config_devdeps	✅ success
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config_wheeldeps	✅ success
devdeps	✅ success
docker_image	⏩ skipped
gen_code_coverage	⏩ skipped
metadata	✅ success
python_metapackages	⏩ skipped
python_wheels	⏩ skipped
source_build	⏩ skipped
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