Stop using old MAR format in the second esr60-based alpha
In #26362 (moved) we set MAR_OLD_FORMAT=1
when generating mar files for both release
and alpha
builds.
After the first esr60-based alpha is released, we should remove MAR_OLD_FORMAT=1
for the alpha
builds, but keep it for the release
builds (until the first release
build is released).
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