docs: Added v1.0.0 information to upgrade guide

[chrisnegus]

Description Added information to the Karpenter Upgrade Guide, describing how to upgrade to v1.0.0.

Does this change impact docs?

• Yes, PR includes docs updates

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[coveralls]

Pull Request Test Coverage Report for Build 10291245143

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 79.261%

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Files with Coverage Reduction	New Missed Lines	%
pkg/providers/amifamily/ami.go	1	91.67%

Totals
Change from base Build 10288803223:	-0.01%
Covered Lines:	5981
Relevant Lines:	7546

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💛 - Coveralls

[engedaam]

Some small nits

[jmdeal]

checkpointing

[njtran]

TODOs

• Detail downgrade process
• Add references to the upgrade guide in the v1 migration guide and vice versa
• Metrics why some were dropped and what they're replaced with
• Helm changes

[njtran]

LGTM