create named-entity urls using standard URI econding

[exfalsoquodlibet]

Updated sql script for post-extraction processing to create named-entity urls using standard URI econding as advised by devs.

Info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent

The relevant Scheduled Query has been also updated accordingly:

• name: "RUN SCHEDULED Post-extraction processing and count of named entities"
• found at: https://console.cloud.google.com/bigquery/scheduled-queries?project=cpto-content-metadata

Some test cases can be seen here: https://console.cloud.google.com/bigquery?project=cpto-content-metadata&ws=!1m4!1m3!8m2!1s673804617052!2s95dafc4a00b646cea5711c91490452a1

Summary

Add your summary here - keep it brief, to the point, and in plain English. For further information about pull requests, check out the GDS Way.

Checklists

This pull/merge request meets the following requirements:

• [x] code runs
• [x] developments are ethical and secure
• [x] you have made proportionate checks that the code works correctly
• [x] test suite passes
• [ ] developments adhere to AQA plan (see docs/aqa/aqa_plan.md)
• [ ] data log updated (see docs/aqa/data_log.md), if necessary
• [ ] assumptions, and caveats log updated (see docs/aqa/assumptions_caveats.md), if necessary
• [x] minimum usable documentation written in the docs folder

Comments have been added below around the incomplete checks.