Remove HTML tags from fields when generating dbGaP XML files

[gaurav]

At the moment, fields containing HTML tags are passed into dbGaP XML files unchanged (e.g. "1, Yes <b><i> [Complete QC2a-d]</i></b> | 0, No <b><i> [Form complete]</i></b> | 99, Unknown <b><i> [Form complete]</i></b>"), but some tags (e.g. <font>) may interfere with annotation or display. I'm not sure if Roger cleans that up, or if that's something we need to fix here.

[gaurav]

It looks like these are stripped out during ingest into the HEAL Platform MDS (certainly the example included in this issue, which is https://healdata.org/mds/metadata/HDPDD00008, doesn't have the tags). A bit more investigation would be useful to figure out where that is happening.