add block timestamps from peer-observer nodes alice, bob, charlie, dave, erin, frank (~90k blocks since 2024-02 from 6 nodes)

[0xB10C]

This adds the block arrival timestamps extracted from my debug logs I keep for six of my peer.observer nodes. These span about 100k blocks each. I have more that I can add at a later time.

Fixing some issues I ran into (e.g. debug.log's can now contain a rate-limiting marker) along the way.

[0xB10C]

$ python3 qa/block-timestamps/check-block-timestamps.py
  
Checking that timestamps don't deviate too much from block header timestamps
Imported 926401 timestamps from qa/block-timestamps/block-timestamps.csv
Checking timestamps.csv...
No offset problems found.
Statistics about offsets from block timestamps:
source                    count      min        max          mean         stdev        quantiles[s]
0xb10c_peer-observer-frank 94934      -2744s     2546s        54.43s       141.47s      [10.705, 19.1615, 31.115]
0xb10c_peer-observer-charlie 94790      -2746s     2661s        15.87s       37.06s       [8.026, 15.644, 25.475250000000003]
0xb10c_peer-observer-erin 94062      -2746s     2111s        15.80s       38.31s       [7.87375, 15.465, 25.293249999999997]
0xb10c_peer-observer-bob  94347      -2746s     2115s        15.66s       36.77s       [7.821, 15.389, 25.196]
0xb10c_peer-observer-dave 92324      -2746s     1831s        15.71s       36.50s       [7.863, 15.471499999999999, 25.318749999999998]
0xb10c_peer-observer-alice 93351      -2746s     1804s        15.75s       38.36s       [7.824, 15.419, 25.238]
0xb10c_rs2                120391     -3440s     2739s        22.20s       52.07s       [11.0, 20.0, 29.0]
vostrnad_node1            40107      -489s      2767s        20.99s       39.50s       [12.0, 21.0, 30.0]
n-thumann                 55358      -3439s     2399s        53.02s       61.88s       [31.0, 45.0, 62.0]
darosior_node0            42628      -493s      2091s        20.50s       31.52s       [11.0, 20.0, 29.0]
0xb10c_monitoring1        149103     -3440s     1672s        21.37s       28.49s       [10.645, 19.875, 29.127]
KIT_monitorB              238464     -3440s     2898s        20.96s       29.48s       [9.835, 19.269, 29.133]
KIT_monitor2              433620     -4418s     3918s        20.09s       44.29s       [9.663, 19.5045, 30.287]
KIT_monitor1              430091     -4418s     5571s        20.12s       45.92s       [9.639, 19.472, 30.243]
0xb10c_memo               51491      -1708s     1442s        27.06s       45.43s       [11.0, 20.0, 30.0]
offing-gcp                10927      -268s      635s         21.47s       31.92s       [10.0, 19.0, 28.0]
0xb10c_memo-old           72693      -2130s     682s         20.90s       30.47s       [9.0, 19.0, 30.0]
Check successful.

[0xB10C]

I used zgrep "UpdateTip: new best=" debug.log-202*-bob.gz > update-tip-bob.log on my logs to do extract this. This might come in handy if I want to do this again or for other nodes.