Pass pylance version in (#7900)

package.json

@@ -2,6 +2,6 @@
     "name":  "ptvs",
     "private":  true,
     "devDependencies":  {
-                            "@pylance/pylance":  "2024.4.1"
+                            "@pylance/pylance":  "2024.5.1"
                         }
 }

test.yml

@@ -1,5 +1,11 @@
 # used for testing stuff in azdo
 
+parameters:
+- name: pylanceVersion
+  displayName: Pylance Version
+  type: string
+  default: latest
+
 trigger:
   none
 
@@ -16,7 +22,7 @@ variables:
   ORGANIZATION: 'DevDiv'
   PROJECT: 'DevDiv'
   PIPELINE_ID: 14121
-  RUNTIME_PARAMS: 'pylanceVersion:12345'
+  RUNTIME_PARAMS: 'pylanceVersion:${{ parameters.pylanceVersion }}'
 
 steps: