Same CSS function data in multiple files

[sideshowbarker]

We seem to be tracking data for some CSS functions in multiple files:

calc()

• https://github.com/mdn/browser-compat-data/blob/master/css/at-rules/media.json#L199
• https://github.com/mdn/browser-compat-data/blob/master/css/types/calc.json#L4

element()

• https://github.com/mdn/browser-compat-data/blob/master/css/properties/background-image.json#L53
• https://github.com/mdn/browser-compat-data/blob/master/css/types/image.json#L131

image-set()

• https://github.com/mdn/browser-compat-data/blob/master/css/properties/background-image.json#L214
• https://github.com/mdn/browser-compat-data/blob/master/css/types/image.json#L2111

minmax() and repeat()

• https://github.com/mdn/browser-compat-data/blob/master/css/properties/grid-template-rows.json#L227
• https://github.com/mdn/browser-compat-data/blob/master/css/properties/grid-template-columns.json#L227

symbols()

• https://github.com/mdn/browser-compat-data/blob/master/css/properties/list-style-type.json#L4207
• https://github.com/mdn/browser-compat-data/blob/master/css/properties/list-style.json#L51

url()

• https://github.com/mdn/browser-compat-data/blob/master/css/properties/content.json#L147
• https://github.com/mdn/browser-compat-data/blob/master/css/types/url.json#L4

[ramiy]

Related: https://github.com/mdn/browser-compat-data/issues/10563#issuecomment-848996913

[gsnedders]

see also: #6349 (because arguably this is just a matter of support for the types as defined)