[7.0.0] Add more details to the warning message in --keep_going mode (#20450)
The current message is too generic and not helpful for the user.
```
Before:
WARNING: errors encountered while analyzing target '//:bin': it will not be built
---
After:
WARNING: errors encountered while analyzing target '//:bin', it will not be built.
Target //:bin is incompatible and cannot be built, but was explicitly requested.
Dependency chain:
//:bin (8250b5) <-- target platform (@@local_config_platform//:host) didn't satisfy constraint @@platforms//:incompatible
```
Fixes https://github.com/bazelbuild/bazel/issues/20443
Commit
https://github.com/bazelbuild/bazel/commit/c5493b9557502fe6ec48e78b0b5f06f4c1d75238
PiperOrigin-RevId: 588363260
Change-Id: I70e151cd9baa6a0dd7b307b7ddeb9f43ee30b526
Co-authored-by: Googler <leba@google.com>{Fast, Correct} - Choose two
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