This commit was built as a revert commit followed by deletion:
* Revert "androidenv: manually (!) delete oldest revision of google
images".
* Delete other revision.
Using `systemImageType = "google_apis_playstore"` (and `abiVersion =
"x86"` and `platformVersion = "28"` - that I expect resolved to
`97d9d4f4a2afa8b0f5d52e90748e19c10406ca93`), the symptom is:
```
Warning: Observed package id 'system-images;android-28;google_ndk_playstore;x86' in inconsistent location '/nix/store/...-androidsdk/libexec/android-sdk/system-images/android-28/google_apis_playstore/x86' (Expected '/nix/store/...-androidsdk/libexec/android-sdk/system-images/android-28/google_ndk_playstore/x86')
...
Error: Package path is not valid. Valid system image paths are:
system-images;android-28;google_ndk_playstore;x86
```
How is the actual image name `google_ndk_playstore` when the fetched
image has id `google_apis_playstore`?
Attempt keeping - of the two images - the one that looks simpler.
For the `"28".google_apis."x86"` images, in the XML the differences
are: more complex license (what is `arm-dbt`?); higher emulator.
Namely:
```
<uses-license ref="android-sdk-license"/>
<dependencies>
<dependency path="patcher;v4"/>
<dependency path="emulator">
<min-revision>
<major>27</major>
<minor>1</minor>
<micro>7</micro>
...
<uses-license ref="android-sdk-arm-dbt-license"/>
<dependencies>
<dependency path="patcher;v4"/>
<dependency path="emulator">
<min-revision>
<major>29</major>
<minor>1</minor>
<micro>12</micro>
```
Analogously for `"28".google_apis_playstore."x86"`.
