chore(proguard): Remove --android-manifest argument (#2940)

### Description
This argument does not do anything, so we will remove it.

### Issues
- Resolves #2874
- Resolves [CLI-200](https://linear.app/getsentry/issue/CLI-200/remove-upload-proguards-android-manifest-argument)

Author: szokeasaurusrex

CHANGELOG.md

@@ -17,7 +17,7 @@ we should rename this section to "Unreleased" -->
   - `SENTRY_API_KEY` environment variable
   - `api_key` configuration file field
   - `apiKey` option in the JavaScript API
-- Removed the `upload-proguard` subcommand's `--app-id`, `--version`, and `--version-code` arguments ([#2876](https://github.com/getsentry/sentry-cli/pull/2876)). Users using these arguments should stop using them, as they are unnecessary. The information passed to these arguments is no longer visible in Sentry.
+- Removed the `upload-proguard` subcommand's `--app-id`, `--version`, `--version-code`, and `--android-manifest` arguments ([#2876](https://github.com/getsentry/sentry-cli/pull/2876), [#2940](https://github.com/getsentry/sentry-cli/pull/2940)). Users using these arguments should stop using them, as they are unnecessary. The information passed to these arguments is no longer visible in Sentry.
 
 ### Improvements
 

src/commands/upload_proguard.rs

@@ -49,16 +49,6 @@ pub fn make_command(command: Command) -> Command {
                     proguard UUIDs into a properties file.",
                 ),
         )
-        .arg(
-            Arg::new("android_manifest")
-                .long("android-manifest")
-                .value_name("PATH")
-                .hide(true)
-                .help(
-                    "[DEPRECATED] This flag is a no-op, scheduled \
-                    for removal in Sentry CLI 3.0.0.",
-                ),
-        )
         .arg(
             Arg::new("write_properties")
                 .long("write-properties")
@@ -100,14 +90,6 @@ pub fn execute(matches: &ArgMatches) -> Result<()> {
         );
     }
 
-    if matches.get_one::<String>("android_manifest").is_some() {
-        log::warn!(
-            "[DEPRECATION NOTICE] The --android-manifest argument is deprecated, \
-            and is scheduled for removal in Sentry CLI 3.0.0. \
-            The argument is a no-op."
-        );
-    }
-
     let paths: Vec<_> = match matches.get_many::<String>("paths") {
         Some(paths) => paths.collect(),
         None => {