fix(simulation): correct exponential sampling and cache behavior logic

- Fixed incorrect use of exponential sampling for `next_request` and `next_refresh` timings.
- Adjusted cache eviction logic to properly handle capacity checks.
- Improved simulation output and logging for least accessed objects.
- Corrected CSV export to include index labels for better data clarity.
- Reran experiments

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

experiments/No_Refresh_0_5s_ttl/details.csv

@@ -1,100 +1,100 @@
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experiments/No_Refresh_0_5s_ttl/hit_age.csv

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experiments/No_Refresh_0_5s_ttl/overall_hit_age.csv

@@ -1,9 +1,9 @@
 ,hit_rate,avg_age
 count,100.0,100.0
-mean,0.24997190226308422,0.24085664637735987
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-max,0.375,0.3870967741935484
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