Current motivation: Testing after https://github.com/pybind/pybind11_bazel/pull/46 was merged.

Convert pybind11_bazel dependency to FLOATING (we own it).

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Preparation for enabling presubmit UBSAN testing.

UBSAN error fixed by this CL:

```
SUMMARY: UndefinedBehaviorSanitizer: nullptr-with-nonzero-offset third_party/pybind11_abseil/tests/status_example.cc:111:66 in
```
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Make pybind11_abseil `StatusNotOk.__str__` compatible with long-established Google-internal behavior.

For example:

* Old: `INTERNAL: GetMemoryInfo error`
* New: `GetMemoryInfo error [INTERNAL]`

This behavior change is likely to only affect asserts in test code.

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Changes behavior of code introduced with https://github.com/pybind/pybind11_abseil/commit/4b5def2c2cdb16e9e099ed521acb03445cf44c3f on May 31, 2022, motivated by Google-internal developments.

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Before this change, `__repr__` is identical to `__str__`. There are countless articles on the web explaining the expected difference, for example:

* https://www.tutorialspoint.com/str-vs-repr-in-python

Quoting "Key differences":

* str(): Make object readable; Generate output to end user
* repr(): Required code that reproduces object; Generate output for developer

"Required code that reproduces object" is impractical for `Status`, mainly because there is not good way to concisely include the payload, but even just the `.message()` can potentially be very long. Therefore it is best to simply use the default `__repr__`, as is the case for the vast majority of types of significant complexity.

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For interoperability with other Python-C/C++ binding systems, including the raw Python C API.

Small follow-on to https://github.com/pybind/pybind11_abseil/commit/64e85ee3129638458368e5b9fdfa53b6dc16a859

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This enables universal interoperability with other Python-C/C++ binding systems, including the raw Python C API.

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To avoid clobbering the error to be reported with a `UnicodeDecodeError`.

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Change third_party/pybind11_abseil `StatusNotOk` to raise an exception when constructed with a plain `str`.

Step 2 of third_party/pybind11_abseil `StatusNotOk` convergence with the Google-internal type.

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This change preserves the established behavior, but sets the stage for follow-on convergence steps.

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Currently `.code`, `.message` are simple members (ideally these would be properties).

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Fixes a bug introduced with https://github.com/pybind/pybind11_abseil/commit/01fd6b4fa611ee3cb67420fcb6e6fd6006215ee0

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