Fix ScopeEventFieldTypeMismatch error for TLogMetrics

[jzhou77]

Backport changes made to TLogServer in #4616 back to old TLog implementations.
Old implementations were using SpecialCounter, which is string. The new type
is int64_t. Without the change, we can have many events like:

<Event Severity="30" Time="1658165532.958152" DateTime="2022-07-18T17:32:12Z" Type="ScopeEventFieldTypeMismatch" ID="0000000000000000" EventType="TraceEvent.TLogMetrics" FieldName="QueueDiskBytesUsed" OldType="Int64" NewType="String" ThreadID="2451559325190099131" Machine="10.242.248.26:4703" LogGroup="xxxx" Roles="TL" />

100k 20220720-053124-jzhou-8ff497fb9837551f passed

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