Rename to Bottlerocket

[tjkirch]

This renames everything in the repo to Bottlerocket, except for some things listed below.

bottlerocket-admin and bottlerocket-control repos were created in ECR, and v0.2 and v0.3 of each image were uploaded in us-west-2 and us-east-1.

Remaining work, outside this PR:

• Build and upload new SDK, after working with @iliana to merge update from license-scan: Add Cargo.toml support #719.
• Add migration for new admin/control containers; @etungsten is working on the migration code that will allow this to happen (special because it's a templated setting). That migration can encompass the couple host container changes we have. - migrations: host-containers default version migration redux and new common migration 'ReplaceTemplateMigration' #717

"Thar" references not updated in this PR:

• AWS account names/emails
• The name of "thar-be-settings"
• Host container names in existing migrations, since that was their name then...
• References to GitHub URL, slack channel, email addresses
• The default TUF repo bucket name "thar-be-updates-in-us-west-2" in the timestamp Lambda
• Lookaside cache URL (I think we should update this sometime, but not urgent)
• The dogswatch package is now named for bottlerocket, but still refers to a repo that doesn't exist; we can fix this when we have the repo!

Testing done:

• workspaces/ unit tests pass.
• New SDK built for x86_64 and aarch64, and used to build an AMI.
• AMI built, connects to cluster, pods run OK.
• Existing Thar host containers work, except for SSH host key persistence (because it looks in /.thar which isn't there anymore).
• New Bottlerocket host containers work.

Testing not done, but that will happen before next release:

• dogswatch: hoping @jahkeup can help here.
• Upgrade testing, because of missing migrations; see "remaining work" above.

[tjkirch]

As discussed separately, this push removes the change to the partition labels, instead leaving them as "THAR-*" so we don't break upgrades yet. That change will go to another PR for when we're ready to merge it.

This also removes the "THAR"/"BOTTLEROCKET" filesystem labels, which were unused and potentially confusing.

(I retested by remaking an AMI, running pods, etc.)

[tjkirch]

This push addresses some of @bcressey's comments. Retested with a new AMI.

[tjkirch]

This push kills the crab. (sorry about the double push, it's just the "fixup" commit that I then rebased in)

[jahkeup]

The dogswatch changes look good to me - it builds and passes unit tests. I don't have the bandwidth to run the dogswatch tests mentioned for this PR, but will follow up with the next-release testing to check that we're not broken as @tjkirch hinted at.

[tjkirch]

Rebased on develop to fix conflicts; this removed a couple thar/bottlerocket references thanks to Jake's changes, and I updated the licenses squashfs change to use "bottlerocket" in paths and such. Built a new AMI and pods are OK, /usr/share/licenses still works.

[tjkirch]

iliana and I merged this with #719 and are building new SDKs; once those are uploaded we'll push the merge.