time: TestLongAdjustTimers is taking too long on plan9-arm

[millerresearch]

The TestLongAdjustTimers test is consistently timing out after 60 seconds on plan9-arm, for example here:

--- FAIL: TestLongAdjustTimers (60.88s)
    tick_test.go:228: timer expired
FAIL
FAIL	time	205.604s

This test is already being skipped on android and ios where it takes too long; I suggest skipping on Plan 9 as well.

[gabyhelp]

Related Issues

• time: TestTimerModifiedEarlier failures with "timer took too long" on plan9-arm #50470
• cmd/go: tests regularly timing out on Plan 9 #18047 (closed)
• os: test is timing out on plan9-arm #45941 (closed)

Related Code Changes

• time: skip TestTimerModifiedEarlier on plan9/arm

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[gopherbot]

Change https://go.dev/cl/693955 mentions this issue: time: skip TestLongAdjustTimers on plan9 (too slow)