[roll] Roll fuchsia [lowpan] compress the fuchsia build version if too long.

The OpenThread API limits the vendor software version string length to
16 bytes (OT_NETWORK_DIAGNOSTIC_MAX_VENDOR_SW_VERSION_TLV_LENGTH), but
Fuchsia build strings (e.g., "31.20260312.103.1") often exceed.

This change tries to compress the version string while preserving as
much human-readable identifying information as possible, it use a
fallback strategy:
- if the version string is less then 16 bytes, return it as-is.
- otherwise, attempts to remove the century from the date field
- if still longer, attempts to remove the date field entirely
- if still longer, attempts to strip the dots (only keep one for release
  version for readability)
- if still longer, return a strict first 16-character truncation.

Original-Original-Bug: 473918100
Test: fx test //src/connectivity/lowpan/drivers/lowpan-ot-driver:lowpan-ot-driver-test
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1582496
Original-Original-Revision: a53f328913e2c3dfa7b0a3c1998830fe171753ec
GitOrigin-RevId: 8cb09b6cf456e98b65ca4cace091e3ddedfb1200
Change-Id: I38074f41728cab0fb325f6731dfb3b85d7b4e582
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1633501
Cr-Commit-Position: refs/heads/main@{#193775}