tracing/histograms: Add histograms to hist_vars if they have referenced variables

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2023-53560 · Microsoft / collected KEV context

cve-program · CVE-2023-53560

• https://git.kernel.org/stable/c/4ffad1528e81c91769d9da1f8436080861c8ec67
• https://git.kernel.org/stable/c/4815359056083c555f97a5ee3af86519be5166de
• https://git.kernel.org/stable/c/1576f0df7b4d1f82db588d6654b89d796fa06929
• https://git.kernel.org/stable/c/97f54b330c797ed27fba8791baeaa38ace886cbd
• https://git.kernel.org/stable/c/5fd32eb6fa0ac795aa5a64bc004ab68d7b44196a
• https://git.kernel.org/stable/c/4a540f63618e525e433b37d2b5522cda08e321d7
• https://git.kernel.org/stable/c/6018b585e8c6fa7d85d4b38d9ce49a5b67be7078

No related operational record is retained in the current change model.