[Console Monaco] Resolve uncaught error from tokenizer (#188746)

Fixes #186765

## Summary

This PR fixes the uncaught error from the tokenizer when we add the
input below:

<details>
<summary>Test input</summary>

```
GET /
GET _cluster/settings?include_defaults&flat_settings&filter_path=*.*interval*
PUT _cluster/settings
{
  "persistent": {
    "indices.lifecycle.poll_interval": "10s"
  }
}

GET _cat/${TEST}

PUT _data_stream/test-cold
POST test-cold/_rollover

GET _cat/indices?v&h=
GET _cat/indices/.alerts-observability.threshold.alerts-default,.alerts-default.alerts-default,

GET _cat/indices,aliases

GET _cat/shards/test*?v
"""
index                                    shard prirep state      docs store dataset ip         node
.ds-test-cold-2024.05.20-000002          0     p      STARTED       0  249b    249b 172.19.0.2 839a1677bdab
.ds-test-cold-2024.05.20-000002          0     r      UNASSIGNED                               
restored-.ds-test-cold-2024.05.20-000001 0     p      STARTED       0  289b    289b 172.19.0.2 839a1677bdab
"""

GET restored-.ds-test-cold-2024.05.20-000001/_settings

"""
          "snapshot": {
            "snapshot_name": "2024.05.20-.ds-test-cold-2024.05.20-000001-test-h5yr-_tws6es6biug0uqbw",
            "index_uuid": "8tXgFf_cR2KIMofpj2I7Uw",
            "repository_uuid": "3i3oPavIQZGeYOQzRZajyQ",
            "index_name": ".ds-test-cold-2024.05.20-000001",
            "repository_name": "fs",
            "snapshot_uuid": "3S3CDGZgSh2XQSRO3UTxVA"
          }
"""

DELETE _snapshot/fs/2024.05.20-.ds-test-cold-2024.05.20-000001-test-h5yr-_tws6es6biug0uqbw

POST _ilm/stop

POST restored-.ds-test-cold-2024.05.20-000001/_clone/.ds-test-cold-2024.05.20-000001
{
  "settings": {
    "index.store.type": null,
    "index.recovery.type": null
  }
}

# Check the cloned index & shards
GET _cat/indices/.ds-test-cold-2024.05.20-000001?v
GET _cat/shards/.ds-test-cold-2024.05.20-000001?v

PUT _snapshot/fs/2024.05.20-.ds-test-cold-2024.05.20-000001
{
  "indices": ".ds-test-cold-2024.05.20-000001",
  "ignore_unavailable": false,
  "include_global_state": false
}

# Check the taken snapshot

GET _snapshot/fs/2024.05.20-.ds-test-cold-2024.05.20-000001
"""
      "snapshot": "2024.05.20-.ds-test-cold-2024.05.20-000001",
      "uuid": "GC7xoG1yQN6W5LIUMqCDYA",
"""




PUT _snapshot/fs/temp-snapshot-for-recovery
{
  "indices": "restored-.ds-test-cold-2024.05.20-000001",
  "ignore_unavailable": false,
  "include_global_state": false
}
GET _snapshot/fs/temp-snapshot-for-recovery
"""
      "snapshot": "temp-snapshot-for-recovery",
      "uuid": "NgFDtQMESv2o4BZd0dsP8g",
"""

GET .ds-test-cold-2024.05.20-000002
"""
{
  ".ds-test-cold-2024.05.20-000002": {
    "aliases": {},
    "mappings": {
      "_data_stream_timestamp": {
        "enabled": true
      },
      "properties": {
        "@timestamp": {
          "type": "date"
        }
      }
    },
    "settings": {
      "index": {
        "lifecycle": {
          "name": "test"
        },
        "routing": {
          "allocation": {
            "include": {
              "_tier_preference": "data_hot"
            }
          }
        },
        "hidden": "true",
        "number_of_shards": "1",
        "provided_name": ".ds-test-cold-2024.05.20-000002",
        "creation_date": "1716175738940",
        "priority": "100",
        "number_of_replicas": "1",
        "uuid": "nvldBwt2QxeQzpkrbK69qQ",
        "version": {
          "created": "8503000"
        }
      }
    },
    "data_stream": "test-cold"
  }
}
"""


```
</details>

**How to test:** Add the input above in Console editor and verify that
there is no uncaught error in the browser error.

This change also resolves some highlighting inconsistencies, where some
text was incorrectly highlighted as a `method` and `url` tokens:

Before:

<img width="919" alt="Screenshot 2024-07-19 at 17 15 05"
src="https://github.com/user-attachments/assets/3865f5ee-3f8e-4f85-a44d-a7ee73338621">


<img width="919" alt="Screenshot 2024-07-19 at 17 24 33"
src="https://github.com/user-attachments/assets/07326394-8425-40fd-863e-8314e15763fb">

<br><br>

Now:

<img width="919" alt="Screenshot 2024-07-19 at 17 12 07"
src="https://github.com/user-attachments/assets/e2afde99-bc49-4dc5-ad4f-4727ef604534">


<img width="919" alt="Screenshot 2024-07-19 at 17 25 39"
src="https://github.com/user-attachments/assets/e8778eb2-93be-461f-80f0-abdc810874b4">

packages/kbn-monaco/src/console/lexer_rules/console_editor.ts

@@ -21,12 +21,13 @@ export const languageConfiguration: monaco.languages.LanguageConfiguration = {
 
 export const lexerRules: monaco.languages.IMonarchLanguage = {
   ...consoleSharedLexerRules,
+  ignoreCase: true,
   tokenizer: {
     ...consoleSharedLexerRules.tokenizer,
     root: [
       ...consoleSharedLexerRules.tokenizer.root,
       // method
-      matchTokensWithEOL('method', /([a-zA-Z]+)/, 'root', 'method_sep'),
+      matchTokensWithEOL('method', /get|post|put|patch|delete|head/, 'root', 'method_sep'),
       // whitespace
       matchToken('whitespace', '\\s+'),
       // text