Greek update: NotoSans-Italic and NotoSansDisplay-Italic

[moyogo]

• Update Noto Sans Display Italic and Noto Sans Italic based on @irenevl’s googlefonts/noto-source#374
• Make Noto Sans Display Italic an Optical size axis variation in Noto Sans Italic
• Remove Noto Sans Display Italic

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[davelab6]

Since this is not a true optical size variation, I propose defining it as a "Contrast (Grotesque)" axis with tag CTGR and min default max 0 0 100

[google-cla[bot]]

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We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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[moyogo]

@davelab6 Thanks I wasn't sure whether I should change the tag and had a branch with different the values, but changing the tag is more appropriate.