Removed bazel_latest from default dependencies

[UebelAndre]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

The bazel_latest image takes quite a bit of time to fetch (Fetching @bazel_latest; fetching 65s or more) which causes undesired slowness when performing Bazel sync and adds a sizable dependency which is never used. To my knowledge, this image is only used for testing:

rules_docker/contrib/repro_test.bzl

Lines 266 to 279 in 6c3c59b

	container_repro_test = rule(
	attrs = dicts.add(_container.image.attrs, {
	"base": attr.label(
	default = "@bazel_latest//image",
	allow_rules = [
	"container_image_",
	"container_import",
	"toolchain_container_",
	],
	doc = "An image target compatible with the `base` attribute of " +
	"the container_image rule to build and reproduce the " +
	"'image' in. This image must have Bazel and docker " +
	"installed and available in the PATH.",
	),

Users should not be forced to include this dependency in their workspace unless it's needed for a public facing rule.

Issue Number: N/A

What is the new behavior?

The images macro is no longer called in the deps macro. This prevents the bazel_latest image from being added to users workspace when loading container_deps per the Setup documentation.

Does this PR introduce a breaking change?

• Yes
• No

Users who depend on this image will now have to load it explicitly via:

load("@io_bazel_rules_docker//repositories:images.bzl", rules_docker_images = "images")

rules_docker_images()

Though, it would have been in user's best interest to load this image themselves in the first place because this image does not provide a digest and therefore isn't cached as effectively as it should be.

Other information

[UebelAndre]

It's not clear to me why RBE is running into this failure

(15:21:43) WARNING: Download from http://keyserver.ubuntu.com/pks/lookup?op=get&fingerprint=on&search=0xEB9B1D8886F44E2A failed: class com.google.devtools.build.lib.bazel.repository.downloader.UnrecoverableHttpException Checksum was 589abea78ff5784ac519b5aada2a8f4e76d06041113d4def643532dcd7437b36 but wanted e9a596d0c194a562be9fd2c2a0994d7885505a1145fed0fbd5ae4c11d56220a0
(15:21:43) ERROR: An error occurred during the fetch of repository 'launchpad_openjdk_gpg':
   Traceback (most recent call last):
	File "/var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/external/bazel_tools/tools/build_defs/repo/http.bzl", line 150, column 33, in _http_file_impl
		download_info = ctx.download(
Error in download: java.io.IOException: Error downloading [http://keyserver.ubuntu.com/pks/lookup?op=get&fingerprint=on&search=0xEB9B1D8886F44E2A] to /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/external/launchpad_openjdk_gpg/file/downloaded: Checksum was 589abea78ff5784ac519b5aada2a8f4e76d06041113d4def643532dcd7437b36 but wanted e9a596d0c194a562be9fd2c2a0994d7885505a1145fed0fbd5ae4c11d56220a0
(15:21:43) ERROR: Error fetching repository: Traceback (most recent call last):
	File "/var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/external/bazel_tools/tools/build_defs/repo/http.bzl", line 150, column 33, in _http_file_impl
		download_info = ctx.download(
Error in download: java.io.IOException: Error downloading [http://keyserver.ubuntu.com/pks/lookup?op=get&fingerprint=on&search=0xEB9B1D8886F44E2A] to /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/external/launchpad_openjdk_gpg/file/downloaded: Checksum was 589abea78ff5784ac519b5aada2a8f4e76d06041113d4def643532dcd7437b36 but wanted e9a596d0c194a562be9fd2c2a0994d7885505a1145fed0fbd5ae4c11d56220a0

I don't get this issue locally and no other build seems to have issues. Help would be greatly appreciated.