PMM-15076 Fix NUMA Details dashboard to show all NUMA nodes by default

[ondrejpatocka]

Problem

• node variable shipped as single-value, hidden, defaulting to 0 - so per-node rows
  ("repeat": "node") only rendered for Node 0 on multi-NUMA hosts.
• Contradicts the user manual: "For each node, this dashboard shows metrics…".

Changes (dashboards/OS/NUMA_Details.json)

• node variable → multi: true, includeAll: true, hide: 0, default $__all
  (now consistent with the sibling zone variable).
• 26 panel queries: node="$node" → node=~"$node" to match the regex substitution
  produced by a multi-value variable.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.97%. Comparing base (d2ea72b) to head (2dccf5e).
⚠️ Report is 1 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5389      +/-   ##
==========================================
- Coverage   43.21%   42.97%   -0.25%     
==========================================
  Files         413      543     +130     
  Lines       42282    44482    +2200     
  Branches        0      591     +591     
==========================================
+ Hits        18274    19117     +843     
- Misses      22139    23434    +1295     
- Partials     1869     1931      +62     

Flag	Coverage Δ
admin	34.94% <ø> (ø)
unittests	41.31% <ø> (?)

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