Unexpected call to FXP FSPIOP_CALLBACK_URL_FX_TRANSFER_PUT handler during FX_RESERVE handling

[kalinkrustev]

There is an associated todo in the notification handler.

Because the FX flow does not include such a call, the FXP implementations will likely not include such handler and it will not be included in the participantEndpoint table in the DB. The result is Invalid template error, which breaks the handling of the FX_RESERVE message:

2024-06-26T14:00:29.648Z - error: Consumer::onError()[topics='topic-notification-event'] - FSPIOPError: Error processing notification message
    at createFSPIOPError (/opt/app/node_modules/@mojaloop/central-services-error-handling/src/factory.js:198:12)
    at Object.createInternalServerFSPIOPError (/opt/app/node_modules/@mojaloop/central-services-error-handling/src/factory.js:314:10)
    at /opt/app/src/handlers/notification/index.js:162:52
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async consumeMessage (/opt/app/src/handlers/notification/index.js:161:21)
FSPIOPError: Invalid template! Template should be a "string" but "undefined" was given as the first argument for mustache#render(template, view, partials)
    at createFSPIOPError (/opt/app/node_modules/@mojaloop/central-services-error-handling/src/factory.js:198:12)
    at Object.reformatFSPIOPError (/opt/app/node_modules/@mojaloop/central-services-error-handling/src/factory.js:333:12)
    at exports.getEndpoint (/opt/app/node_modules/@mojaloop/central-services-shared/src/util/endpoints.js:175:32)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async Object.getEndpoint (/opt/app/src/domain/participant/index.js:76:17)
    at async processMessage (/opt/app/src/handlers/notification/index.js:381:31)
    at async consumeMessage (/opt/app/src/handlers/notification/index.js:161:21)
TypeError: Invalid template! Template should be a "string" but "undefined" was given as the first argument for mustache#render(template, view, partials)
    at Object.render (/opt/app/node_modules/mustache/mustache.js:753:13)
    at exports.getEndpoint (/opt/app/node_modules/@mojaloop/central-services-shared/src/util/endpoints.js:171:21)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async Object.getEndpoint (/opt/app/src/domain/participant/index.js:76:17)
    at async processMessage (/opt/app/src/handlers/notification/index.js:381:31)
    at async consumeMessage (/opt/app/src/handlers/notification/index.js:161:21))