chore(cmake): honor CMAKE_BUILD_TYPE while building bundled grpc and protobuf

[FedeDP]

What type of PR is this?

/kind cleanup

Any specific area of the project related to this PR?

/area build

Does this PR require a change in the driver versions?

What this PR does / why we need it:

Another fix needed for zig (or well, this makes sense in a broader way, but is zig that highlighted the issue).
Otherwise Falco build would fail at link time because:

undefined symbol: google::protobuf::internal::InternalMetadata::~InternalMetadata()

Caused by the fact that we built protobuf with -DNDEBUG (the default value, ie: release mode) but then we built Falco in Debug mode in PR's CI; then, when linking, we were hit by: protocolbuffers/protobuf#9947

Another solution would've been to bump protobuf, but of course it requires to bump grpc and that's a circle of hell.

Don't really know why g++ nor x86_64 zig were not hit by the issue at all, but zig arm64 was.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[FedeDP]

/milestone 0.19.0

[FedeDP]

My upstream test branch chore/zig_build was already updated to cherry pick these changes that finally allowed Falco zig PR to correctly build on arm64: https://github.com/falcosecurity/falco/actions/runs/10679890028/job/29600300776?pr=3307

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.31%. Comparing base (1db10b3) to head (005f397).
Report is 24 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2043   +/-   ##
=======================================
  Coverage   74.31%   74.31%           
=======================================
  Files         253      253           
  Lines       30966    30966           
  Branches     5418     5413    -5     
=======================================
  Hits        23011    23011           
+ Misses       7949     7941    -8     
- Partials        6       14    +8     

Flag	Coverage Δ
libsinsp	74.31% <ø> (ø)

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[Andreagit97]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP

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