[release/6.0] Use Ubuntu 18.04 and dotnet-buildtools-prereq docker images for enterprise linux pipeline #63014
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Backport of #61001 to release/6.0
/cc @akoeplinger
Customer Impact
None, this change only affects our CI environment. We need it to fix a build break in release/6.0 because AzDO removed Ubuntu 16.04 images.
Testing
Tested on CI in main.
Risk
Minimal, just moves to a different pool image.