Ignore bands that have role "metadata" when loading with load_stac

[EmileSonneveld]

https://github.com/eu-cdse/openeo-cdse-infra/issues/333

Fixes these catalogs:
SENTINEL2_GLOBAL_MOSAICS_STAC_COPERNICUS
-> https://stac.dataspace.copernicus.eu/v1/collections/sentinel-2-global-mosaics

LANDSAT_C2_L1_OLI_STAC
-> https://pgstac.demo.cloudferro.com/collections/landsat-c2-l1-oli

[EmileSonneveld]

This is the problematic 'band'

"Product": {
    "href": "https://zipper.dataspace.copernicus.eu/dummy",
    "type": "application/zip",
    "roles": [
        "data",
        "metadata",
        "archive"
    ],
    "title": "Zipped product",
    "alternate": {
        "s3": {
            "href": "s3://eodata/Landsat-9/OLI/L1GT/2022/03/12/LO09_L1GT_137106_20220312_20230424_02_T2.zip",
            "auth:refs": [
                "s3"
            ],
            "description": "S3 storage provided by CloudFerro Cloud and OpenTelekom Cloud (OTC). Use endpoint URL `https://eodata.dataspace.copernicus.eu`.",
            "alternate:name": "S3"
        }
    },
    "auth:refs": [
        "oidc"
    ],
    "alternate:name": "HTTPS",
    "file:local_path": "LO09_L1GT_137106_20220312_20230424_02_T2.zip"
}

Ok band:

"green": {
    "gsd": 30,
    "href": "https://zipper.dataspace.copernicus.eu/dummy",
    "type": "image/tiff; application=geotiff; profile=cloud-optimized",
    "bands": [
        {
            "name": "B3",
            "eo:common_name": "green",
            "eo:center_wavelength": 0.56
        }
    ],
    "roles": [
        "data"
    ],
    "title": "Green Band (B3)",
    "nodata": 0,
    "alternate": {
        "s3": {
            "href": "s3://eodata/Landsat-9/OLI/L1GT/2022/03/12/LO09_L1GT_137106_20220312_20230424_02_T2/LO09_L1GT_137106_20220312_20230424_02_T2_B3.TIF",
            "auth:refs": [
                "s3"
            ],
            "description": "S3 storage provided by CloudFerro Cloud and OpenTelekom Cloud (OTC). Use endpoint URL `https://eodata.dataspace.copernicus.eu`.",
            "alternate:name": "S3"
        }
    },
    "auth:refs": [
        "oidc"
    ],
    "data_type": "uint16",
    "file:size": "93384687",
    "proj:bbox": [
        2273999.8390177847,
        1140299.9150258568,
        2492400.4286099034,
        1360800.362137389
    ],
    "proj:code": "EPSG:3031",
    "proj:shape": [
        7351,
        7281
    ],
    "description": "Collection 2 Level-1 Green Band (B3) Top of Atmosphere Radiance",
    "file:checksum": "d50110d8eb1f3da9361d6ee859c7f72b450c79",
    "alternate:name": "HTTPS",
    "file:local_path": "LO09_L1GT_137106_20220312_20230424_02_T2/LO09_L1GT_137106_20220312_20230424_02_T2_B3.TIF"
}