Exclude idl/ as a source of Go code

[yurishkuro]

Which problem is this PR solving?

• Part of Migrate proto-gen/thrift-gen to jaeger-idl #6494
• Since jaeger-idl repo now includes Go code, as soon as we update the submodule here it's treated as a real source of Go code, including by tools like go fmt, etc.

Description of the changes

• Exclude idl/ from ALL_SOURCES, so that make fmt does not apply to it
• Bump idl submodule to latest

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.25%. Comparing base (cbad04b) to head (34e7b0a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6591      +/-   ##
==========================================
+ Coverage   96.21%   96.25%   +0.03%     
==========================================
  Files         375      375              
  Lines       21397    21397              
==========================================
+ Hits        20588    20596       +8     
+ Misses        616      610       -6     
+ Partials      193      191       -2     

Flag	Coverage Δ
badger_v1	10.63% <ø> (ø)
badger_v2	2.78% <ø> (ø)
cassandra-4.x-v1-manual	16.64% <ø> (ø)
cassandra-4.x-v2-auto	2.72% <ø> (ø)
cassandra-4.x-v2-manual	2.72% <ø> (ø)
cassandra-5.x-v1-manual	16.64% <ø> (ø)
cassandra-5.x-v2-auto	2.72% <ø> (ø)
cassandra-5.x-v2-manual	2.72% <ø> (ø)
elasticsearch-6.x-v1	20.43% <ø> (-0.01%)	⬇️
elasticsearch-7.x-v1	20.50% <ø> (ø)
elasticsearch-8.x-v1	20.67% <ø> (ø)
elasticsearch-8.x-v2	2.77% <ø> (ø)
grpc_v1	12.19% <ø> (ø)
grpc_v2	9.06% <ø> (+<0.01%)	⬆️
kafka-3.x-v1	10.36% <ø> (ø)
kafka-3.x-v2	2.78% <ø> (ø)
memory_v2	2.78% <ø> (ø)
opensearch-1.x-v1	20.56% <ø> (ø)
opensearch-2.x-v1	20.55% <ø> (-0.01%)	⬇️
opensearch-2.x-v2	2.77% <ø> (-0.01%)	⬇️
tailsampling-processor	0.51% <ø> (ø)
unittests	95.11% <ø> (+0.03%)	⬆️

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