feat: Update list of allowed EC2 Instances

[wombelix]

Current instance types added to the allowed list, focus on:

• Family: T, M, C, R, Hpc
• Processor: a, i
• Additional Capabilities: n, z

Non-current generations removed from allowed list.

Default type changed to 't3.medium'.

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[wombelix]

let me check why some instance types are marked as invalid in the static analysis and update the PR

[wombelix]

Diving deeper into the warnings it looks like that hpc7a and hpc6a are not part cfn-lint yet, c7i and r7a were added just 4 days ago (https://github.com/aws-cloudformation/cfn-lint/commit/0daa42cf069dafe14ba46d55a80a5d05731d1ed3), it make sense that the test fails, we don't need them right away, I removed them.

@davmayd I assume that aws-ia-automator-gamma / Static Analysis uses cfn-lint 0.72.0? The instances reported in the output of the previous check run indicate it, some of them were added in cfn-lint 0.72.2. Based on that, I also removed the following instance types / families to satisfy the checks:

- m7i
- m7a
- m6in
- c6in
- r7iz
- r6in

It's not super critical for me right now, but if my assumption is correct: It would be great if cfn-lint could be updated in the PR checks to a more recent version at some point to reduce false positives :) taskcat 0.9.40 and cfn-lint 0.79.10 for example worked very well together in my local test environment.

I will add further instance types at a later point, I'm good with the extended list we have now, feel free to merge the PR.