log: unify UpdateTip values #32996

1. 
   l0rinc commented at 6:00 pm on July 16, 2025: contributor

   The most frequently seen log line prints tip-update data after each successful block connection. During IBD this produces ~900k lines (~250 characters per line), totaling ~220 MB so far.

   Most key=value pairs are written directly, but block time is emitted as date='ISO8601DateTime', adding unnecessary single quotes because the value contains no spaces.

   Removing those quotes shortens every line and reduces a full-IBD debug log by ~1% (about ~2MB).

   Before:

   2025-07-16T04:50:47Z UpdateTip: new best=00000000000000000001f49fb5fb37753c06d78f1a811d707aebf6194bb147e5 height=890000 version=0x25e9a000 log2_work=95.523053 tx=1172414692 date=‘2025-03-29T17:29:01Z’ progress=0.964378 cache=1578.9MiB(11964898txo)

   After:

   2025-07-16T04:50:47Z UpdateTip: new best=00000000000000000001f49fb5fb37753c06d78f1a811d707aebf6194bb147e5 height=890000 version=0x25e9a000 log2_work=95.523053 tx=1172414692 date=2025-03-29T17:29:01Z progress=0.964378 cache=1578.9MiB(11964898txo)

2. log: unify `UpdateTip` values

   The most frequently seen log line prints tip-update data after each successful block connection.
   During IBD this produces ~900k lines (~250 characters per line), totaling ~220 MB so far.
   
   Most `key=value` pairs are written directly, but block time is emitted as `date='ISO8601DateTime'`, adding unnecessary single quotes because the value contains no spaces.
   
   Removing those quotes shortens every line and reduces a full-IBD debug log by ~1% (about ~2MB).
   
   Before:
   > 2025-07-16T04:50:47Z UpdateTip: new best=00000000000000000001f49fb5fb37753c06d78f1a811d707aebf6194bb147e5 height=890000 version=0x25e9a000 log2_work=95.523053 tx=1172414692 date='2025-03-29T17:29:01Z' progress=0.964378 cache=1578.9MiB(11964898txo)
   
   After:
   > 2025-07-16T04:50:47Z UpdateTip: new best=00000000000000000001f49fb5fb37753c06d78f1a811d707aebf6194bb147e5 height=890000 version=0x25e9a000 log2_work=95.523053 tx=1172414692 date=2025-03-29T17:29:01Z progress=0.964378 cache=1578.9MiB(11964898txo)

   b039305d35
3. DrahtBot added the label Utils/log/libs on Jul 16, 2025
4. 
   DrahtBot commented at 6:00 pm on July 16, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32996.

   Reviews

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   Type	Reviewers
   ACK	nervana21

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5. 
   nervana21 commented at 11:05 pm on July 16, 2025: contributor

   tACK b039305

   Before:

   2025-07-16T22:31:33Z UpdateTip: new best=000000000000000000022dabca47b7aabc24d93d0241536ca75dc528d08d5eba height=905352 version=0x20c26000 log2_work=95.713336 tx=1212933015 date=‘2025-07-13T11:06:38Z’ progress=0.998857 cache=8.8MiB(61209txo)

   After:

   2025-07-16T22:54:20Z UpdateTip: new best=0000000000000000000186eed935e4ad209e7aaa4ceeb2542851feaf4b8d426f height=905353 version=0x21624000 log2_work=95.713348 tx=1212936957 date=2025-07-13T11:25:43Z progress=0.998856 cache=2.1MiB(14143txo)

Contributors
l0rinc DrahtBot nervana21

Labels
Utils/log/libs