log the version string on startup

[tzneal]

1. Issue, if available:
N/A

2. Description of changes:
Adds a log line with the version number on startup

3. How was this change tested?
make apply
4. Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: link to issue
• No

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

[tzneal]

I pulled the v0.7.2 images that were build & published with ko and confirmed that they had the correct version symbol defined:

$ readelf -Ws controller | grep project.Version
 84373: 0000000003ba82a0    16 OBJECT  GLOBAL DEFAULT   10 github.com/aws/karpenter/pkg/utils/project.Version
 89395: 0000000002751d34     7 OBJECT  GLOBAL DEFAULT    2 github.com/aws/karpenter/pkg/utils/project.Version.str

$ readelf -x2 controller  | grep 2751d30
  0x02751d30 fdff0000 76302e37 2e320000 00000000 ....v0.7.2......

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