`--enable-manifest` and `--manifest-image-information` deprecation warnings display when options haven't been used
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Issue body
### Bug Description
When updating the CI for the `snapcore/action-build` Github action, I noticed that it generated warnings like:
```
/usr/bin/sudo -u runner -E snapcraft
'--enable-manifest' is deprecated, and will be removed in core24.
'--manifest-image-information' is deprecated, and will be removed in core24.
```
I had not passed either of these command line options, instead setting the `SNAPCRAFT_BUILD_INFO` and `SNAPCRAFT_IMAGE_INFO` environment variables (which is [documented as the supported replacement](https://snapcraft.io/docs/build-options#heading--deprecated)).
### To Reproduce
In a core22 project, run `SNAPCRAFT_BUILD_INFO=1 SNAPCRAFT_IMAGE_INFO={} snapcraft`.
### Environment
Snapcraft 8.3.1 running on Ubuntu 24.04.
### snapcraft.yaml
```shell
base: core22
```
### Relevant log output
```shell
2024-07-15 17:02:36.558 '--enable-manifest' is deprecated, and will be removed in core24.
2024-07-15 17:02:36.558 '--manifest-image-information' is deprecated, and will be removed in core24.
```
### Additional context
_No response_
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