Various logging length constants are unused

[bzbarsky-apple]

Problem

In CHIPLogging.h we have the following constants that as far as I can tell are completely unused:

static constexpr uint16_t kMaxSeparatorLen   = 2;
static constexpr uint16_t kMaxTrailerLen     = 2;
static constexpr uint16_t kMaxMessagePadding = (chip::Logging::kMaxPrefixLen + chip::Logging::kMaxModuleNameLen +
                                                chip::Logging::kMaxSeparatorLen + chip::Logging::kMaxTrailerLen);

There's also kMaxPrefixLen which is used, but incorrectly. See #4729

Proposed Solution

Remove unused/misused constants.

[bzbarsky-apple]

See also https://github.com/project-chip/connectedhomeip/pull/4627 which renamed these constants but did not really change their used-ness.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[bzbarsky-apple]

The unused constants are gone now.