[AUTO-CHERRYPICK] Moved PR check's raw toolchain hashes to the pipeline UI. - branch main (#10324)

Co-authored-by: Pawel Winogrodzki <pawelwi@microsoft.com>

.pipelines/prchecks/PackageBuildPRCheck.yml

@@ -1,10 +1,8 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
-# Since we're boosting our builds by using a private, pre-compiled raw toolchain
-# the pipeline requires defining the following variables outside of the YAML:
-# - rawToolchainCacheURL_AMD64
-# - rawToolchainCacheURL_ARM64
+# The "agentPool" parameter is defined in the "Agent pools (DEV)" variable group.
+# The "rawToolchain*" parameters are defined in the "Raw toolchain info" variable group.
 
 trigger: none
 
@@ -13,15 +11,15 @@ parameters:
     type: object
     default:
       - name: "AMD64"
-        agentPool: "$(DEV_AMD64_Managed)" # Pool defined inside the "Agent pools (DEV)" variable group.
+        agentPool: "$(DEV_AMD64_Managed)"
         maxCPUs: "$(($(nproc) / 2))"
-        rawToolchainCacheURL: "$(rawToolchainCacheURL_AMD64)"
-        rawToolchainExpectedHash: "f56df34b90915c93f772d3961bf5e9eeb8c1233db43dd92070214e4ce6b72894"
+        rawToolchainCacheURL: "$(rawToolchainCacheURL_AMD64_2.0)"
+        rawToolchainExpectedHash: "$(rawToolchainCacheHash_AMD64_2.0)"
       - name: "ARM64"
-        agentPool: "$(DEV_ARM64_Managed)" # Pool defined inside the "Agent pools (DEV)" variable group.
+        agentPool: "$(DEV_ARM64_Managed)"
         maxCPUs: "$(($(nproc) / 3))"
-        rawToolchainCacheURL: "$(rawToolchainCacheURL_ARM64)"
-        rawToolchainExpectedHash: "65de43b3bdcfdaac71df1f11fd1f830a8109b1eb9d7cb6cbc2e2d0e929d0ef76"
+        rawToolchainCacheURL: "$(rawToolchainCacheURL_ARM64_2.0)"
+        rawToolchainExpectedHash: "$(rawToolchainCacheHash_ARM64_2.0)"
   - name: debug
     type: boolean
     default: false
@@ -36,6 +34,7 @@ resources:
 
 variables:
   - group: "Agent pools (DEV)"
+  - group: "Raw toolchain info"
   - name: rpmsArtifactNameBase
     value: RPMs
   - name: toolchainArtifactNameBase