Replace GUARDED_BY with ABSL_GUARDED_BY in preparation for abseil upgrade
#2283
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Summary: Replace
GUARDED_BYwithABSL_GUARDED_BYin preparation for abseil upgradeIn order to upgrade to bazel 7, many of our dependencies (bazel repos) need to be upgraded. In a branch that builds the pixie repo with bazel 7, this was a supporting change I needed to get the build working. abseil/abseil-cpp@ba7a9e2 is where abseil removed the versions of the macro pixie used previously.
Relevant Issues: #2282
Type of change: /kind cleanup
Test Plan: Build should succeed