Performance tests: Fix date time log for commit

[mukeshpanchal27]

Trac ticket: https://core.trac.wordpress.org/ticket/62766

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[mukeshpanchal27]

After 2b7099c we get the Date time.

See

[mukeshpanchal27]

Revert the testing steps

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[felixarntz]

@mukeshpanchal27 Great catch, this looks like a solid fix to me.

[felixarntz]

Committed in https://core.trac.wordpress.org/changeset/59570

[felixarntz]

Reopening because the commit was reverted, see https://core.trac.wordpress.org/ticket/62766#comment:5

I believe we need to reinstate the extra workflow step and run the git command as part of that, then use it as output to pipe it into the COMMITTED_AT environment variable.