Bullseye is EOL, use the archive repo (#23589)

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#### Why I did it

The bullseye-backports section of the repo has been removed from the main repo.

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it

#### How to verify it

Verified by attempting to build slave container:

```
#13 0.522 Get:1 http://archive.debian.org/debian bullseye InRelease [116 kB]
#13 0.538 Get:2 http://archive.debian.org/debian bullseye-updates InRelease [44.0 kB]
#13 0.538 Get:3 http://archive.debian.org/debian bullseye-backports InRelease [48.9 kB]
#13 0.568 Get:4 http://debian-archive.trafficmanager.net/debian-security bullseye-security InRelease [27.2 kB]
#13 0.737 Get:5 http://archive.debian.org/debian bullseye/contrib Sources [43.2 kB]
#13 0.915 Get:6 http://archive.debian.org/debian bullseye/main Sources [8500 kB]
#13 1.037 Get:7 http://debian-archive.trafficmanager.net/debian-security bullseye-security/contrib Sources [1128 B]
#13 1.065 Get:8 http://debian-archive.trafficmanager.net/debian-security bullseye-security/main Sources [250 kB]
#13 1.133 Get:9 http://debian-archive.trafficmanager.net/debian-security bullseye-security/non-free Sources [1352 B]
#13 1.134 Get:10 http://debian-archive.trafficmanager.net/debian-security bullseye-security/main amd64 Packages [389 kB]
#13 1.157 Get:11 http://debian-archive.trafficmanager.net/debian-security bullseye-security/contrib amd64 Packages [2880 B]
#13 1.157 Get:12 http://debian-archive.trafficmanager.net/debian-security bullseye-security/non-free amd64 Packages [1184 B]
#13 1.280 Get:13 http://archive.debian.org/debian bullseye/non-free Sources [81.0 kB]
#13 1.605 Get:14 http://archive.debian.org/debian bullseye/contrib amd64 Packages [50.4 kB]
#13 1.609 Get:15 http://archive.debian.org/debian bullseye/main amd64 Packages [8066 kB]
#13 1.662 Get:16 http://archive.debian.org/debian bullseye/non-free amd64 Packages [96.4 kB]
#13 1.662 Get:17 http://archive.debian.org/debian bullseye-updates/main Sources [7908 B]
#13 1.663 Get:18 http://archive.debian.org/debian bullseye-updates/main amd64 Packages [18.8 kB]
#13 1.663 Get:19 http://archive.debian.org/debian bullseye-backports/non-free amd64 Packages [14.4 kB]
#13 1.663 Get:20 http://archive.debian.org/debian bullseye-backports/main amd64 Packages [403 kB]
#13 1.665 Get:21 http://archive.debian.org/debian bullseye-backports/contrib amd64 Packages [6164 B]
#13 2.755 Fetched 18.2 MB in 2s (8066 kB/s)
#13 2.755 Reading package lists...
#13 3.212 Reading package lists...
#13 3.626 Building dependency tree...
#13 3.709 Reading state information...
```

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Author: mssonicbld

scripts/build_mirror_config.sh

@@ -25,7 +25,7 @@ if [ "$ARCHITECTURE" == "armhf" ]; then
     DEFAULT_MIRROR_SECURITY_URLS=http://deb.debian.org/debian-security/
 fi
 
-if [ "$DISTRIBUTION" == "buster" ]; then
+if [ "$DISTRIBUTION" == "buster" ] || [ "$DISTRIBUTION" == "bullseye" ]; then
     DEFAULT_MIRROR_URLS=http://archive.debian.org/debian/
 fi