Remove pfx file type support in Solo

[jeromy-cannon]

not needed since we are going to only support 0.51 and higher. I followed up with Edward, it looks like 0.51 and higher we no longer need to support PFX in Solo, platform still supports PFX, but PEM is preferred.

a list of files that need to be changed, their might be more, this is just searching for pfx:

• platform_installer.mjs
• flags.mjs, since there will be only one option PEM, then we can remove this flag, which will trigger a need to cascade update other files
• node.mjs
• prompts.mjs
• constants.mjs
• helpers.mjs
• key_manager.mjs
• templates.mjs
• node-local-hedera.test.mjs
• node-local-ptt.test.mjs
• node_pfx_kill.test.mjs
• test_util.js
• key_manager.test.mjs
• keytool.test.mjs

[swirlds-automation]

🎉 This issue has been resolved in version 0.30.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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