Fix 11749 flatgeobuf styleditor cors

[stefanocudini]

Description

• Fix sub issue described here Support for FlatGeobuf by MapStore #11749 (comment)
• added check also for fgb without columns in header, first feature as fallback
• Fix New catalog show FlatGeobuf as new source

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

## Issue

What is the current behavior?
styleeditor is loop loading when CORS blocked

What is the new behavior?
styleeditor loaded

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information

This can be quickly tested by inserting a new layer into new.json in layers and open new map like this:

{
                "id": "countries__d29bd060-faa5-11f0-b91d-e14ce6c1c6b8",
                "format": "fgb",
                "name": "countries",
                "style": {
                    "format": "geostyler",
                    "metadata": {
                        "editorType": "visual",
                        "styleJSON": "{\"rules\":[{\"name\":\"Default Polygon Style\",\"ruleId\":\"955ec020-4aca-11f1-94bd-a3ab945c80ee\",\"symbolizers\":[{\"kind\":\"Fill\",\"color\":\"#f2f2f2\",\"fillOpacity\":0.3,\"outlineColor\":\"#3075e9\",\"outlineOpacity\":1,\"outlineWidth\":2,\"symbolizerId\":\"955ec021-4aca-11f1-94bd-a3ab945c80ee\"}]}]}"
                    },
                    "body": {
                        "rules": [
                            {
                                "name": "Default Polygon Style",
                                "ruleId": "955ec020-4aca-11f1-94bd-a3ab945c80ee",
                                "symbolizers": [
                                    {
                                        "kind": "Fill",
                                        "color": "#f2f2f2",
                                        "fillOpacity": 0.3,
                                        "outlineColor": "#3075e9",
                                        "outlineOpacity": 1,
                                        "outlineWidth": 2,
                                        "symbolizerId": "955ec021-4aca-11f1-94bd-a3ab945c80ee"
                                    }
                                ]
                            }
                        ]
                    }
                },
                "title": "countries",
                "type": "flatgeobuf",
                "url": "https://flatgeobuf.org/test/data/countries.fgb",
                "visibility": true,
                "singleTile": false,
                "dimensions": [],
                "hideLoading": false,
                "handleClickOnLayer": false,
                "useForElevation": false,
                "hidden": false,
                "expanded": false
            },