FT: [FortiGate] Support 8.0

[KarelChanivecky]

Purpose

This PR updates the existing fortinet/fortigate/launch.py launcher to
address several deficiencies in CLI pattern parsing and bootstrap sequencing.

These changes allow the launcher to support a broader set of FOS-derived
products, such as FortiProxy, as well as newer FortiGate versions. The pattern
recognition and command execution logic has been refactored into a table-based
finite state machine to make future feature support easier to add.

This PR does not add new user-facing features. It focuses on making the
existing launcher work reliably across the tested Fortinet images.

Fixes #461

Changes

• Improve CLI state detection using more version-tolerant regex patterns.
• Refactor bootstrap_spin() into a table-based finite state machine.
• Add a command queue mechanism for ordered CLI operations.
• Handle credential change requests during first login.
• Handle hostname update flow.
• Add explicit fatal exits for unrecoverable startup errors.
• Add state logging to improve debugging.
• Log all terminal output, not only unmatched output.
• Detect missing VM images and fail with a clear error.
• Improve the error message when launch fails because the configured password
  does not satisfy Fortinet password policy requirements.

Testing

Test:

• Deploy the VM with containerlab.

Assert:

• Hostname is updated.
• Credentials are set.
• The appliance is reachable over SSH.

Tested on:

• FGT 8.0.0 build0167 GA (Debug)
• FGT 7.6.6 build3652 GA (Debug)
• FGT 7.4.12 build2902 GA
• FGT 7.0.19 build0696 GA
• FGT 6.4.16 build2098 GA
• FPX 7.6.6 build1628 GA
• FPX 7.4.13 build0722 GA (Debug)
• FPX 7.2.16 build0465 GA
• FPX 7.0.23 build0222 GA

Notes

• The default launch.py password was not changed. Some FortiProxy images may
  ship with a stricter default password policy. To launch those images
  successfully, pass a compliant password with the password argument.
• Internal impl detail: The cmd prompt detection is purposely not handling vdom. For the implemented cmd state, we assume we arrive at global scope, and will end at global scope. Thus, something like "FGT-VM64-KVM (root) (Interim)# " will not be handled.

[KarelChanivecky]

Please hold. There is a change coming in the default hostname string that will not match the regex in this PR.

[KarelChanivecky]

Please hold. There is a change coming in the default hostname string that will not match the regex in this PR.

Fixed with d077076