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MDEV-27848: Remove unused wait/io/file/innodb/innodb_log_file
The performance_schema counter wait/io/file/innodb/innodb_log_file is always reported as 0. The way how redo log writes are being waited for was refactored in commit 30ea63b by the introduction of flush_lock and write_lock. Even before that change, all the wait/io/file/innodb/ counters were always 0 in my tests. Moreover, if the PMEM interface that was introduced in commit 3daef52 is being used, writes to the InnoDB log file will completely avoid any system calls and performance_schema instrumentation. In commit 685d958 also the reads of the redo log (during recovery) would bypass any system calls.
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