[VAULT-34703] UI: Remove InputSearch component and replace with Hds::Form::TextInput

[didoo]

Description

What does this PR do?

• replaced InputSearch instance with Hds::Form::TextInput::Base
  • Notice:
    • I have changed the color of the button from secondary to primary (more in line with the HDS guidance, being the primary action in that context)
    • we may want to add a label to the field (and use Hds::Form::TextInput::Field instead), but it's a decision for the Vault Engineers/Designers + @MelSumner)
• completely removed the InputSearch component (not used/needed anymore)

Before:

🕹️ Video: https://github.com/user-attachments/assets/7c7e8c87-4724-4e8f-bc5c-dde55f869818

After:

🕹️ Video: https://github.com/user-attachments/assets/03c466db-9f0a-4f9a-ab9f-56baa7be42db

Jira ticket: https://hashicorp.atlassian.net/browse/VAULT-34703

TODO only if you're a HashiCorp employee

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• ENT Breakage: If this PR either 1) removes a public function OR 2) changes the signature
  of a public function, even if that change is in a CE file, double check that
  applying the patch for this PR to the ENT repo and running tests doesn't
  break any tests. Sometimes ENT only tests rely on public functions in CE
  files.
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  description. Also, make sure the changelog is in this PR, not in your ENT PR.

[didoo]

I have changed the color of the button from secondary to primary (more in line with the HDS guidance, being the primary action in that context)

[didoo]

This input is missing a label, which is a problem from an accessibility standpoint. Some options we may have to fix this:

• convert the Hds::Form::TextInput::Base to Hds::Form::TextInput::Field and add a visible label (in which case, who should I speak to in order to know which text label to use? @Monkeychip do I need to speak with a Vault designer or you can provide one that I can use?)
• add some aria label or an invisible label (but I am not sure what would be the benefit, in this case, ti hide the label)

@MelSumner other suggestions or thoughts?

[github-actions]

CI Results: failed ❌

[didoo]

Closing this PR because I've missed that the component was used with "old" Ember code instantiation ({{component @fellbackComponent}}) - See comment here: https://hashicorp.atlassian.net/browse/VAULT-34703?focusedCommentId=682298