build(release): add jvolkman to BCR maintainers and set github_user_id (#4230)

Keep the BCR module metadata aligned with current project maintainers
and BCR validation requirements.

Add Jeremy Volkman (`jvolkman`) to the BCR maintainer lists and
populate `github_user_id` for all maintainers across the BCR metadata
templates.

.bcr/gazelle/metadata.template.json

diff --git a/.bcr/gazelle/metadata.template.json b/.bcr/gazelle/metadata.template.json
index 017f9d3..1565bc0 100644
--- a/.bcr/gazelle/metadata.template.json
+++ b/.bcr/gazelle/metadata.template.json
@@ -4,12 +4,20 @@
         {
             "name": "Richard Levasseur",
             "email": "richardlev@gmail.com",
-            "github": "rickeylev"
+            "github": "rickeylev",
+            "github_user_id": 34175098
         },
         {
             "name": "Ignas Anikevicius",
             "email": "bcr-ignas@use.startmail.com",
-            "github": "aignas"
+            "github": "aignas",
+            "github_user_id": 240938
+        },
+        {
+            "name": "Jeremy Volkman",
+            "email": "jeremy@jvolkman.com",
+            "github": "jvolkman",
+            "github_user_id": 124501
         }
     ],
     "repository": [

.bcr/metadata.template.json

diff --git a/.bcr/metadata.template.json b/.bcr/metadata.template.json
index 9d85e22..eb8eed3 100644
--- a/.bcr/metadata.template.json
+++ b/.bcr/metadata.template.json
@@ -4,12 +4,20 @@
     {
       "name": "Richard Levasseur",
       "email": "richardlev@gmail.com",
-      "github": "rickeylev"
+      "github": "rickeylev",
+      "github_user_id": 34175098
     },
     {
       "name": "Ignas Anikevicius",
       "email": "bcr-ignas@use.startmail.com",
-      "github": "aignas"
+      "github": "aignas",
+      "github_user_id": 240938
+    },
+    {
+      "name": "Jeremy Volkman",
+      "email": "jeremy@jvolkman.com",
+      "github": "jvolkman",
+      "github_user_id": 124501
     }
   ],
   "repository": [

.bcr/sphinxdocs/metadata.template.json

diff --git a/.bcr/sphinxdocs/metadata.template.json b/.bcr/sphinxdocs/metadata.template.json
index 017f9d3..1565bc0 100644
--- a/.bcr/sphinxdocs/metadata.template.json
+++ b/.bcr/sphinxdocs/metadata.template.json
@@ -4,12 +4,20 @@
         {
             "name": "Richard Levasseur",
             "email": "richardlev@gmail.com",
-            "github": "rickeylev"
+            "github": "rickeylev",
+            "github_user_id": 34175098
         },
         {
             "name": "Ignas Anikevicius",
             "email": "bcr-ignas@use.startmail.com",
-            "github": "aignas"
+            "github": "aignas",
+            "github_user_id": 240938
+        },
+        {
+            "name": "Jeremy Volkman",
+            "email": "jeremy@jvolkman.com",
+            "github": "jvolkman",
+            "github_user_id": 124501
         }
     ],
     "repository": [