Fixed multiple slash in avatar paths

[hanzlamateen]

Summary

This PR fixes following error when using MinIO as storage provider and probably also when using AWS S3 as reported by a user in discord.

[16:59:42.962] ERROR: Object name contains unsupported characters.
    component: "server-core"
    err: {
      "type": "S3ServiceException",
      "message": "Object name contains unsupported characters.",
      "stack":
          XMinioInvalidObjectName: Object name contains unsupported characters.
              at throwDefaultError (/home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/smithy-client/dist-cjs/default-error-handler.js:8:22)
              at /home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/smithy-client/dist-cjs/default-error-handler.js:18:39
              at de_PutObjectCommandError (/home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/client-s3/dist-cjs/protocols/Aws_restXml.js:5701:12)
              at processTicksAndRejections (node:internal/process/task_queues:95:5)
              at async /home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/middleware-serde/dist-cjs/deserializerMiddleware.js:7:24
              at async /home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/middleware-signing/dist-cjs/middleware.js:14:20
              at async /home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/middleware-retry/dist-cjs/retryMiddleware.js:27:46
              at async /home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/middleware-flexible-checksums/dist-cjs/flexibleChecksumsMiddleware.js:58:20
              at async /home/hanzlamateen/etherealengine2/node_modules/@aws-sdk/middleware-logger/dist-cjs/loggerMiddleware.js:7:26
              at async S3Provider.putObject (/home/hanzlamateen/etherealengine2/packages/server-core/src/media/storageprovider/s3.storage.ts:241:24)
              at async uploadVariant (/home/hanzlamateen/etherealengine2/packages/server-core/src/media/upload-asset/upload-asset.service.ts:61:3)
              at async Promise.all (index 0)
              at async addGenericAssetToS3AndStaticResources (/home/hanzlamateen/etherealengine2/packages/server-core/src/media/upload-asset/upload-asset.service.ts:183:3)
              at async Promise.all (index 0)
              at async uploadAvatarStaticResource (/home/hanzlamateen/etherealengine2/packages/server-core/src/user/avatar/avatar-helper.ts:198:46)
              at async /home/hanzlamateen/etherealengine2/packages/server-core/src/user/avatar/avatar-helper.ts:127:52
              at async Promise.all (index 7)
              at async installAvatarsFromProject (/home/hanzlamateen/etherealengine2/packages/server-core/src/user/avatar/avatar-helper.ts:103:3)
              at async onProjectEvent (/home/hanzlamateen/etherealengine2/packages/server-core/src/projects/project/project-helper.ts:198:12)
              at async seeder (/home/hanzlamateen/etherealengine2/packages/server-core/src/seeder.ts:60:5)
              at async Feathers.app.setup (/home/hanzlamateen/etherealengine2/packages/server-core/src/sequelize.ts:117:13)
      "name": "XMinioInvalidObjectName",
      "$fault": "client",
      "$metadata": {
        "httpStatusCode": 400,
        "requestId": "1767E78DDE4AE482",
        "extendedRequestId": "dd9025bab4ad464b049177c95eb6ebf374d3b3fd1af9251148b658df7ac2e3e8",
        "attempts": 1,
        "totalRetryDelay": 0
      },
      "Code": "XMinioInvalidObjectName",
      "Key": "static-resources/avatar/public//CyberbotSilver.glb",
      "BucketName": "etherealengine-static-resources",
      "Resource": "/etherealengine-static-resources/static-resources/avatar/public//CyberbotSilver.glb",
      "RequestId": "1767E78DDE4AE482",
      "HostId": "dd9025bab4ad464b049177c95eb6ebf374d3b3fd1af9251148b658df7ac2e3e8"
    }

References

#8054

Checklist

• If this PR is still a WIP, convert to a draft
• When this PR is ready, mark it as "Ready for review"
• ensure all checks pass
• Changes have been manually QA'd
• Changes reviewed by at least 2 approved reviewer

QA Steps

List any additional steps required to QA the changes of this PR, as well as any supplemental images or videos.

[HexaField]

Nice