Bazel 6.x: Mismatched target_configured and target_completed events with aspects

### Description of the bug:

If `//:x.bzl` re-exports the aspect `bar` defined in `//:private/x.bzl`, then applying `//:x.bzl%bar` yields a BES with mismatched aspect labels in the events: `target_configured` has `aspect: "//:x.bzl%bar"` but `target_completed` has `aspect: "//:private/x.bzl%bar"`.

The bug is fixed in Bazel 7 by https://github.com/bazelbuild/bazel/commit/5cd3d872ffa24c7816cc2962dc3e989b68ef7f79. There, both events have `aspect: "//:private/x.bzl%bar"`.

Filing this issue as a placeholder -- ultimately I'd like to cherry-pick this to the 6.x branch.

### Which category does this issue belong to?

Core, Remote Execution

### What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

You'll need to send the BES somewhere and dump the tool events.

Create an empty workspace, and these files:

`BUILD`:

```
genrule(
name = "x",
srcs = ["BUILD"],
outs = ["x.out"],
cmd = "echo $$FOO > $@",
)
```

`x.bzl`:

```
load("//:private/x.bzl", _bar = "bar")
bar = _bar
```

`private/x.bzl`:

```
def _impl(target, ctx):
return []

bar = aspect(
implementation = _impl,
attr_aspects = ["srcs"],
)
```

Then, build with Bazel 6.4.0 (or 6.5.0-rc1; it has the same bug):

```
echo "6.4.0" > .bazelversion

bazel \
--batch \
--ignore_all_rc_files \
build \
--bes_results_url=https://[YOUR_BES_SERVICE]/invocation/ \
--bes_backend=grpcs://[YOUR_BES_SERVICE] \
--aspects x.bzl%bar \
--action_env FOO=$RANDOM \
//:x
```

### Which operating system are you running Bazel on?

linux x86-64

### What is the output of `bazel info release`?

release 6.4.0

### If `bazel info release` returns `development version` or `(@non-git)`, tell us how you built Bazel.

_No response_

### What's the output of `git remote get-url origin; git rev-parse master; git rev-parse HEAD` ?

```text
n/a
```

### Is this a regression? If yes, please try to identify the Bazel commit where the bug was introduced.

All older Bazel versions I tried (6.4.0, 6.0.0, 5.4.0, 4.2.0) exhibit this issue. But it is fixed in Bazel 7.0.0.

The Bazel commit that **fixed** it was https://github.com/bazelbuild/bazel/commit/5cd3d872ffa24c7816cc2962dc3e989b68ef7f79

### Have you found anything relevant by searching the web?

_No response_

### Any other information, logs, or outputs that you want to share?

_No response_

Review the linked Bazel 7 fix commit, then reproduce the issue using BUILD, x.bzl, and private/x.bzl with Bazel 6.4.0 and a BES backend. Compare the aspect labels in target_configured and target_completed events; done means the 6.x behavior matches the corrected label handling and the reproduction no longer shows a mismatch.

Written by the indexing model from the issue text.