…lastic#194354)

## Summary

This PR is a follow up to elastic#192665 and addresses a bunch of feedback and
fixes including:

- [X] Adds support for updating/editing entries
- [X] Fixes initial loading experience of the KB Settings Setup/Table
- [X] Fixes two bugs where `semantic_text` and `text` must be declared
for `IndexEntries` to work
- [X] Add new Settings Context Menu items for KB and Alerts
 - [X] Add support for `required` entries in initial prompt
* See [this
trace](https://smith.langchain.com/public/84a17a31-8ce8-4bd9-911e-38a854484dd8/r)
for included knowledge. Note that the KnowledgeBaseRetrievalTool was not
selected.
* Note: All prompts were updated to include the `{knowledge_history}`
placeholder, and _not behind the feature flag_, as this will just be the
empty case until the feature flag is enabled.

TODO (in this or follow-up PR):
 - [ ] Add suggestions to `index` and `fields` inputs
 - [ ] Adds URL deeplinking to securityAssistantManagement
- [ ] Fix bug where updating entry does not re-create embeddings (see
[comment](elastic#194354 (comment)))
 - [ ] Fix loading indicators when adding/editing entries
 - [ ] API integration tests for update API (@e40pud)

### Checklist

Delete any items that are not applicable to this PR.

- [X] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
* Docs being tracked in
elastic/security-docs#5337 for when feature
flag is enabled
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
Co-authored-by: Patryk Kopycinski <contact@patrykkopycinski.com>
(cherry picked from commit 7df3672)