GH-46806: [Ci][Dev][Swift] Remove Swift related settings (#46807)

### Rationale for this change

#46803 Removed switch implementation. But, Some Swift relate files are still exists.

### What changes are included in this PR?

Remove Swift related settings 

### Are these changes tested?

No.

### Are there any user-facing changes?

No but for developers of the swift implementation it has been moved to their own repository.
* GitHub Issue: #46806

Authored-by: Hiroyuki Sato <hiroysato@gmail.com>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>

Author: hiroyuki-sato

ci/docker/ubuntu-swift.dockerfile

@@ -151,5 +151,3 @@ r/tools/nixlibs-allowlist.txt
 .gitattributes
 ruby/red-arrow/.yardopts
 .github/pull_request_template.md
-swift/data-generator/swift-datagen/go.sum
-swift/CDataWGo/go.sum

ci/scripts/swift_test.sh

@@ -157,7 +157,6 @@ x-hierarchy:
   - ubuntu-cpp-thread-sanitizer
   - ubuntu-cpp-emscripten
   - ubuntu-r-valgrind
-  - ubuntu-swift
   - ubuntu-verify-rc
   - r
   - r-revdepcheck
@@ -1039,21 +1038,6 @@ services:
     volumes: *ubuntu-volumes
     command: *python-command
 
-  ubuntu-swift:
-    # Usage:
-    #   docker compose build ubuntu-swift
-    #   docker compose run --rm ubuntu-swift
-    # Parameters:
-    image: ubuntu-swift
-    build:
-      context: .
-      dockerfile: ci/docker/ubuntu-swift.dockerfile
-    shm_size: *shm-size
-    volumes: *ubuntu-volumes
-    command: >
-      /bin/bash -c "/arrow/ci/scripts/swift_test.sh /arrow"
-
-
   fedora-python:
     # Usage:
     #   docker compose build fedora-cpp